If the laptop does not turn on (the power indicator is on) after the device has been operating for some time, you should think about the impact on the machine of viruses. Computer infection often leads to the fact that the computer stops working in normal mode. Sometimes it comes to BIOS damage by viruses. Accordingly, there will be a problem with turning on the laptop.
It is unlikely that you will be able to fix the problem on your own. As with most of the previously mentioned cases, it is best to take your computer to a service center. They will help Not only restore the laptop’s performance, but also cure it from viruses.
Fortunately, this scenario is quite rare. But it should not be ruled out. Especially if the user himself admits the presence of viruses in the computer. Sometimes problems with turning on the laptop appear after the operating system has been disinfected. Then it is enough to reinstall first “BIOS”, then OS. After that, no problems will bother you anymore.
Sometimes it happens that although the power indicator is on, the laptop does not turn on, but previously it worked normally, the hard drive becomes a prerequisite for the problem. Small glitch. And the computer will refuse to start. But the power button will light up. You may also notice that the fan is operating normally. Buttons “Nam Lok” while others light up and go out, as expected.
It is recommended to disassemble the laptop and disconnect the hard drive. In this state, try to turn on the device again. Did not help? Then you can carefully reattach the component. If the problem lay in a failure, then now it will disappear.
The power indicator is on, the laptop does not turn on: causes and solutions
Sometimes it turns out that although the power indicator is on, the laptop does not turn on. Why is this happening? What should you Pay attention to? What may be required to correct the situation? Understanding the questions posed is not as easy as it seems. After all, a computer. The equipment is unpredictable. Problems, especially when turning on, can be the result of many failures. Some go straight to service centers. This is not recommended. It is advisable to first try to diagnose the problem yourself. Maybe it will be possible to cope with the situation without assistance.
Power light is on, laptop won’t turn on? The reasons for this phenomenon are different. The first thing to think about. This is a video card malfunction. In the case of a stationary computer, it is easy to detect and fix a breakdown or failure. It is enough to remove this component and connect it to another machine.
But in the case of laptops, you have to try. It is recommended that if you suspect a breakdown or malfunction of the video card, contact the service centers for help. Or call some system administrator. You can also try to diagnose the problem yourself. Usually the laptop turns on by itself. The cooler can be heard. But there are pictures on the screen. Sometimes you can even hear the operating system loading.
Samsung laptop won’t turn on? The power indicator is on, is the cooler working? The next scenario is one of the rarest. And it’s almost impossible to diagnose it yourself.
The error under study can appear when the south or north bridge is damaged in a laptop. Why does this happen? Bridge problems are caused by different methods. For example, by short circuiting due to temperature differences. If, for example, a USB port is damaged on a laptop because of this, it is likely that the problem under study will appear.
There is only one method of struggle. Repair of damaged components. The most efficient way is to buy a new computer. After all, rarely repaired components work on laptops for a long time. Here, each user independently decides what to do.
What’s next? The power indicator is on, the laptop will not turn on, but the problem with the video card can be excluded? It is likely that the monitor is broken or damaged in the device. An extremely rare phenomenon that still occurs in practice.
If the display is broken, then most likely, “symptoms” breakdowns will be exactly the same as in the case of the video card. There will be no images on the monitor, but the sound of turning on the operating system will appear.
You will not be able to solve this problem on your own. If only by purchasing a new laptop. In such circumstances, you can contact the service center. Maybe the display can be repaired. But usually the devices after such a repair do not work for a long time. In the end, you still have to replace the laptop with a new one.
The following situation can be corrected without assistance. Power light is on, laptop won’t turn on? The main reasons for this phenomenon. It’s either a crash or a factory reset.
It is likely that the settings “BIOS” lost. This caused the problem under study on the laptop. In this situation, it is recommended that you completely reset the BIOS. After that, the computer should work at full strength.
Lack of ingredients
What else could be a consequence of the auto products problem? If we are talking about a new laptop, which has not worked before, do not exclude the absence of any components. If the machine itself turns on, but nothing is displayed on the screen, and the CapsLock and NumLock buttons are NOT extinguished, most likely the BIOS does not initialize.
It is likely that the laptop has a processor or RAM. Or, when it comes to a previously functioning device, the reason may lie in the breakdowns of the listed components.
Power light is on, laptop won’t turn on? Diagnosing an incident requires certain knowledge from the user. Yes, you shouldn’t take your computer for repair right away. But it should be borne in mind that most problems are usually solved with the help of a professional.
You can solve the situation on your own if, for example, the problem lies in the battery. It is likely that she is discharged. Then it is enough to connect the power supply (wire) to the network and to the machine. Then try to turn on the device again. It is best to wait a few minutes before pressing the laptop’s power button. Let the battery get some power. This technique turns out to be quite effective.
Some people recommend removing the battery completely from the laptop and then reconnecting the power cord. Then turn on the computer and watch the situation. If the machine is working at full capacity, then nothing else needs to be done. Otherwise, you will have to look for the source of the problem elsewhere.
As practice shows, problems with the battery or a discharged laptop. These are frequent occurrences. Perhaps the safest and most easily removable without assistance.
Instead of a conclusion
What can be summed up? It should be noted that in most cases, both diagnostics and troubleshooting are reduced to contacting a service center. Most often, many do so. After all, a laptop. This is an extremely complex device. It is not as easy to repair it yourself as a stationary analogue.
If you figure out why the computer does not turn on, and did not work out, you can immediately contact specialized centers. If there is a suspicion of a specific problem in it, it is imperative to inform the service employees.
The power indicator is on, the laptop does not turn on: causes and solutions
In some cases, it turns out that, despite the fact that the power indicator is on, the laptop does not turn on. Why does this situation arise? What do you need to pay special attention to? What may be required to correct this situation? It is actually not as easy to understand all the emerging issues as it might seem at first glance. The personal computer is a rather unpredictable piece of equipment. Power up problems can be the result of many failures. Some users are in a hurry to go to service centers. This is not recommended. First, it is advisable to independently diagnose the problem that has arisen. It may be possible to cope with the situation without outside help.
The laptop won’t turn on even though the power light is on? There are various reasons for this phenomenon. The first thing you might think about is a problem with the video card. In the case of a stationary PC, it is quite easy to detect and fix such a breakdown. To do this, just take out this component and connect it to another machine. But in the case of laptops, the user will have to try. If you suspect a malfunction or breakdown of the video card, it is recommended to contact the service centers for help or call the system administrator for help. You don’t even have to try to diagnose the problem yourself. The laptop usually turns on by itself. you can hear the cooler. But there is no picture on the screen. Sometimes you can even hear the operating system loading.
If the power indicator is on, but the laptop does not turn on and the problem with the video card is excluded, then the monitor may be damaged or broken in the device. This is an extremely rare occurrence that sometimes occurs in practice. If the display is broken, then the reasons for the breakdown are likely to be the same as in the case of the video card. In this case, there will be no images on the monitor, but the sound of turning on the OS will appear. You will NOT be able to deal with this problem on your own. Your only option is to buy a new laptop. You can try to contact the service center under similar circumstances. Perhaps the display can be repaired there. Usually, after such a repair, the devices do not work for long. Ultimately, you still have to replace the laptop with a new one.
The following possible situation can be corrected without assistance. What if the power light is on but the laptop still won’t turn on? The main reasons for this phenomenon are a crash or reset. Perhaps the BIOS settings are out of order. It is for this reason that the problem in question could occur on the laptop. In this situation, it is recommended to perform a BIOS reset and the computer should then be fully operational.
Lack of ingredients
What else could have caused this problem? If we are talking about a new laptop, which worked before, this should not be ruled out the absence of any components. If the laptop itself turns on, but nothing is displayed on the screen, and the NumLock and CapsLock buttons do not go out, then the BIOS is probably being initialized. Probably, the laptop has RAM or a processor. If we are talking about a device that was previously functioning, then the reason may be hidden in the breakdowns of the components listed above.
In some cases, it happens that despite the power indicator is on, the laptop still does not turn on, although it worked normally before. The hard drive is causing the problem. One small crash is enough for the computer to refuse to start. In this case, the power button will still be lit. You may also notice that the fan is operating normally. In this case, the NumLock buttons and others light up and go out, as expected. It is recommended to disassemble the laptop and disconnect the hard drive. Now try switching on again in this state. It did not help? Then you can try again to gently attach the component. If the problem was a crash, then it should go away.
What if the power light is on but the laptop still won’t turn on? Diagnosing the problem in this case will require certain knowledge from the user. DO NOT rush to take your computer for repair. It should be borne in mind that most of these problems are usually solved with the help of a specialist. You can solve the situation yourself if the problem is with the battery. She was probably just discharged. Then it will be enough just to connect the power to the network and the computer and try to turn on the devices again. It is best to wait a few minutes before pressing the laptop power button. This will allow the battery to receive some charge. This technique turns out to be quite effective. Some experts also recommend removing the battery completely from the laptop and then connecting the power cord to it. After that, you need to turn on the computer and observe the situation. If the computer is working at full capacity, then nothing else needs to be done. Otherwise, the source of the problem will have to be addressed elsewhere. Practice shows that a discharged laptop or battery problems are quite common. These problems are eliminated quite easily and without assistance.
What to do if Samsung laptop won’t turn on? In this case, the power indicator is on and the cooler is working. The following reason is quite rare. It is almost impossible to diagnose it yourself. This malfunction can appear if the laptop is damaged in the south or north bridge. Why does this situation arise? Bridge problems can be caused by various causes, such as short circuits caused by temperature differences. If, because of this, the USB port on the laptop is damaged, then the appearance of the problem under study will be quite likely. In this case, there will be only one method of fixing this problem. repairing damaged components. Buying a new PC will be the most effective way to solve this problem. Repaired components in laptops are unlikely to last long. Here, each user will have to independently decide what to do.
If the laptop refuses to turn on, but the device has previously functioned for some time, then you should think about the impact on the device of viruses. Often, a computer infection leads to the fact that the computer simply stops functioning normally. In some cases, it comes down to BIOS virus damage. In this case, problems with turning on the laptop may occur. It is unlikely that you can fix the problem yourself. As with most of the previously mentioned cases, it is best to take your computer to a service center right away. Here you will be helped to restore the laptop to work and cure it from viruses. Fortunately, this scenario is quite rare. However, it should be excluded, especially in cases where the user himself admits the presence of viruses on the computer. In some cases, problems associated with switching on the laptop occur after the OS is treated. In this case, it will be enough to first reinstall the BIOS, and then the operating system. After that, no problems should bother you.
Let’s summarize preliminary results. To begin with, it is worth noting that diagnostics and troubleshooting in most cases boils down to contacting a service center. Most often, many do just that. After all, a laptop is a rather complex device. It is actually not as easy to repair it yourself as a desktop computer. If you cannot figure out on your own why the computer does not turn on, then you can immediately contact a specialized service center for help. If you suspect a specific problem, be sure to inform the service center staff about it.
Why the laptop won’t turn on?
If your laptop does not turn on when you press a button, whether with a battery or without a battery, with a power supply connected or not, and most importantly, the lights are off (see photo), then the laptop’s power circuit is to blame. In many laptops, in the first link of the power circuit (where 18-19V from the laptop’s power supply goes) there are protective elements. diodes and fuses. Diodes protect against reverse voltage (it can appear in a laptop when using a non-native charger), and fuses provide overcurrent and short circuit protection. After overvoltage and reverse voltage protection, there is a control microcircuit. a multicontroller. She often fails.
Other malfunction options
, it depends on what was damaged, what kind of model. The guarantee for such work is issued.
Go to the laptop repair page or call us to consult.
|HP||2500||1 Week||a week is set for diagnostics|
|Apple||8000||2 weeks||replacement of SMC from donor|
|Asus, Acer, Lenovo, etc.||2000||1 week||week is laid for diagnostics|
The multicontroller is out of order
The reason for this may be a flashed firmware of the microcircuit, water damage or voltage surges on the bus from the power supply (all 19 Volts from the power supply are supplied to the cartoon!). One way or another, it fails and does not give us an indication in the connected charger, does not give a response to the button and the laptop does NOT start. Such a multicontroller needs to be changed! In some laptops, multicontrollers need to be flashed (programmed) before installation, the manufacturer writes the data necessary for the logic to work in the flash memory of the microcontroller. Most often, multicontrollers without firmware come across, such controllers are easily installed, verification also Takes little time.
If there is a short circuit on one of the main power rails of the laptop (1V, 3.3V, 5V, 12V), then you can get the same symptoms as when the multicontroller fails.
A short circuit can occur when the laptop is not assembled correctly (overtightened the bolts, short to the case, or passed the wire insulation), when water gets into the laptop, under voltage, the MOSFET keys in the down-stabilizer circuit are out of order, 19V got where it should be 5V, other ICs are out of order, and so on.
The laptop does not turn on, the lights are off
What is a multicontroller, what it does and how is it related to indicators
A multicontroller, or, as it is often called by the master, “cartoon” is a microcircuit that generates a signal to power the processor, video card, USB buses, and second components.
The power button is put into the multicontroller, when you press it, the cartoon checks all tires for short circuit and gives permission to start.
The processor unlocks and starts reading the code from the BIOS. This is how the laptop starts booting. But in our case, there is a download. And there are no indicators either. LEDs for power, hard drive and keyboard unit are also fed into the multicontroller, sometimes NOT directly, through other circuits.
Why are the indicators off??
First of all, do you have a battery connected? Some laptops will not have LED indication without battery connected.
Imagine a wizard who diagnoses the laptop power circuit: first of all, the charger and laptop connector will pass the test, because they often break out, the contacts get dirty, the charging connector is the most frequent breakdown in the power circuit. Let’s say the charging connector is intact, the voltage goes through it to the “first link”, but the indicators do not light up like that, comments on the reaction enable button. Next, you need to check the power button itself, does it work? On older laptops, the button oxidizes internally and DOES NOT close the contacts to give a power-on signal. After the initial “rough” protection for short circuit and polarity reversal, there is a special microcircuit that supervises and controls all the main modules of the laptop for power. This is a multicontroller.
Power button malfunction
In old laptops, the contact of the power button often oxidizes, it is enough to find this malfunction, replace the button, and everything will work. Operation Takes no pain in a couple of hours, it does not cost one and a half thousand rubles.
- Defective elements of the video subsystem (video card, monitor, video cable). The absence of an image on the monitor, even if everything except the video is working, in the eyes of the user it looks like NOT turning on the computer.
- The BIOS firmware has flown (on some laptops, the BIOS rally is manifested by a complete lack of response to the power button).
- A defective or unsupported processor is installed on the board.
- Defective processor power supply system (VRM).
- The RAM or its batteries are faulty.
- On old motherboards. Northbridge or bridge power failure.
The computer does NOT turn on completely
After cleaning the laptop
There are situations when, after cleaning, the laptop stops turning on. The fan may start or a squeak may be heard. Some models also start flashing.
Cleaning a laptop involves disassembling it. The first thing to do is to disassemble it again and check the connection of all components, as well as the installation of the cooling system. It will not be superfluous Pay attention to the thermal grease and the health of the tubes that serve for heat removal.
If the RAM modules were removed during the cleaning process, then you should try to remove them again, clean the contacts and reinstall them. You also need to check if the laptop starts up with the hard drive and optical drive disconnected.
The laptop does not turn on, what to do?
Published date 16.12.2019
What do we mean when we say,
Let’s figure it out in more detail so as not to harm the computer
Laptops have become part of the life of a modern person. Like other techniques, they sometimes break. When the laptop does not turn on, then you should not panic, but you should find the cause and fix it. In most cases, you will be able to restore your computer to work.
That the computer won’t turn on
Very often, people say that the laptop does not turn on at all, and they imply that Windows does NOT boot. This is not entirely correct reasoning, but it is popular among ordinary users. Therefore, when someone says that their computer will not turn on, be aware that by this complaint, the owner may mean the following:
- The computer really does not turn on: there is no reaction to pressing the power button at all.
- The computer turns on, but not completely: sometimes it is limited to the lights on the system unit and keyboard, sometimes. to the sounds of the system speaker, sometimes when you press the power button, the fans start to work, and then nothing happens. One common detail. the screen remains black.
- The computer turns on and immediately turns off or goes into an endless reboot until the picture appears on the screen.
- The computer turns on and runs, but it does NOT start the operating system.
The first 3 situations are of hardware origin, that is, they are associated with a malfunction or incorrect connection of equipment. The latter is most often caused by operating system errors, car products, for example, due to a failed Windows 7 upgrade to Windows 10, as well as device driver failures. In the case of drivers, Windows startup is usually interrupted by a blue screen of death. BSOD.
In more rare cases, the inability to boot the OS is also associated with hardware problems. as a rule, RAM or hard disk.
Windows does NOT start
Failure to start Windows in most cases does NOT indicate a hardware problem. Therefore, you can try to reinstall it, roll back to the previous state of the computer, or use the recovery tools from the manufacturer.
In the hardware part, most often the inability to boot the OS is associated with hard disk problems. In this case, it will have to be replaced. Previously, you can try to diagnose with special utilities by booting from removable media.
Why a black screen on a laptop and it won’t turn on
Almost every second Windows user faces a problem when the laptop does not turn on and at the same time only has to contemplate a black screen. We can say that this is almost the most common breakdown.
However, everything may NOT be so serious and it is possible to run to the service center for help. First of all, you need to figure out the causes of the malfunction yourself. Perhaps, you will be able to fix the problem with your own hands, and not by contacting specialists.
Device repair. Reset BIOS
Maybe the black screen problem appeared immediately after the user made some changes to the basic BIOS settings. In such a situation, it is necessary to reset these very settings and return to the factory settings, that is, the original.
To complete this task, you must adhere to the following instructions:
As soon as the laptop was turned on, immediately press the F10 button and hold it for at least 10 seconds
Then the BIOS itself should open;
After that, you should press the F9 key;
Then click Enter (these actions will help you return to the original settings)
The next step is to press the F10 button again;
To save the new settings, you must click Enter;
Then you should reboot the device.
If the computer works as before after restarting, then all problems have been fixed. However, if these frauds did not bring a positive result, it is recommended to proceed to the next step.
Reasons for malfunction
The reasons why the user cannot turn on the laptop can be divided into several categories. Among them:
The device may have overheated, resulting in damage to the south or north bridges;
Problems with the video card or processor;
The battery could be damaged, but this happens quite rarely;
The problem is in the hardware settings of the computer;
In the last two cases, you can cope with troubles yourself at home.
Failure and cease to perform its functions and or another part may due to:
Careless handling of equipment;
Ingress of moisture and various debris into the system.
Resetting hardware settings
What if you need to reset all hardware settings? For this:
Users must disconnect the laptop from the power source;
Unplug the charger
Next, press and hold the power (power on) key of the device for 20 seconds;
Then you need to insert the battery into place or connect the power system;
Turn on the laptop;
After that, select the item “Normal Windows startup”;
If these actions did not help to solve this problem, it is worth moving on to the next point.
What to do if the laptop turns on for a long time and a black screen appears
Black screen and laptop take a long time to turn on? The reason for this may not necessarily be the breakdown of the part. First, you should remember all the latest machinations done with the device.
If the device worked intensively for a long time, then it is most likely overheating. In this case, the laptop needs to be repaired by a qualified technician. Perhaps new programs or games were installed before that. After that, a reboot was performed, and the laptop did not turn on, then these may be Windows errors.
If the laptop does not turn on when using only one battery. Perhaps it is simply DISCHARGED and there is no point in panic. If the charge is in full order, then it is worth connecting the computer to the network.
After the device was connected to the network, it turned on without any problems, then the fault lies in the battery.
Perhaps it needs to be replaced with a new one. But if the computer still does not work, you need to check if all the plugs are in place and if they do NOT come off. The wire may have been pinched or broken somewhere.
It is recommended to check if there is voltage at the outlet. Each laptop has a special light that signals the battery charge and connection to the network. If all the indicators are on and the device does not turn on, the error may be something else.
It could also be a problem with the hardware settings of the device. In this case, it is not necessary to contact a specialist. The basic steps to fix this problem can be done with your own hands without anyone’s help. To do this, you must reset the hardware settings. The following guidelines will help you cope with this task.
Screen health check
If the laptop does not turn on the first time, and the screen is black, perhaps the whole problem lies in the screen itself. To find out for sure, you need to check the health of the computer screen.
This recommendation should be used only if the power key was pressed and after that the laptop began to show signs of life. I.e:
The hard disk started working;
Cooler noise is heard;
However, the image did not appear, then an additional monitor should be connected to the laptop. As a rule, all laptops have a special connector so that you can connect another one. If after rebooting the device the operating system is loaded, then the problem lies in the screen.
In this case, you should contact the service center and consult with specialists.
Reinstalling the OP module
The image on the display may NOT appear due to car products problems with contacts, as well as due to a malfunction of the memory module.
In this case, you can solve this problem by:
Removing the RAM module from the laptop;
After that, it is recommended to purge the connectors in order to get rid of the clogged.
If there is only one RAM strip and at the same time there are several free connectors available for it, you can change its connection place.
Before you start extracting RAM, you need to read the detailed instructions and strictly adhere to THESE recommendations.
Instructions for Removing RAM:
Before starting to work on disassembling the device, you must first disconnect it from the power source;
The next step will be to unscrew the bolts that hold the cover of the compartment where the RAM is located;
If there is no separate compartment, you will need to remove the back cover of the laptop (it is recommended to do this carefully so as not to damage the device)
The random access memory is attached with clamps on one side and the other, they must be bent;
Only then can the RAM be removed;
Also, don’t forget about purging the connectors;
Then you can swap them (if available)
Then you can insert the memory module back;
The next step is assembling the laptop;
After that, it is worth putting the battery in place;
There are unpleasant cases when these machinations are NOT capable of giving the proper result. In this case, the last way out may be to reinstall the BIOS.
To cope with this task you need:
Go to the manufacturer’s Internet portal;
Go to the section with drivers;
In the search box, enter the laptop model without errors;
Find and download the (latest) BIOS version.
The downloaded archive should contain detailed instructions. Following it, you can reinstall the BIOS.
In addition, the user should take into account that these reinstallation steps are only necessary as a last resort. To begin with, the most correct thing would be to contact a service center and rely on the professionalism of specialists. After all, the problem with turning on the computer may not be in the BIOS at all, but in the video card or other details. In this case, the reasons can be very different.
These recommendations will help solve the problem of turning on the laptop and the appearance of a black screen if the breakdown is not technical in nature, but the hardware settings are to blame. At the same time, you can save your time and money on trips and maintenance in expensive service centers. Since this breakdown cannot be called serious and you can deal with it yourself, without having the appropriate skills. M
The first thing to check is whether the power plug of the device is tight enough and whether the wire is damaged by bending, and also whether the battery is charged. Surprisingly, such simple problems often confuse users. If everything is in order, then check the following aspects point by point:
Battery performance. Connect the power to the laptop. The indicator should light up, notifying the battery charging. If it does not light up, then remove the battery and, using an eraser, clean the contacts on the laptop and on the battery, if there is a semblance of plaque or oxidation on them. Then use up the remaining charge by holding down the power activation button. Insert the battery and try turning on the device. If it does not turn on, then it is likely that the battery is out of order.
The ramps may become unusable due to, for example, liquid spilled on the keyboard. Then the laptop has a black screen. To check the RAM, you need to disconnect the laptop from the network, remove the battery, Unscrew the bolts from the cover under which the memory is installed. Remove the modules and use the same eraser to clean the contacts. Put everything back and try to turn on the device.
Next, you need to check the video system. Check that the ribbon cable, which connects the video card or motherboard to the graphics matrix, is working properly. To do this, you can connect a TV or a regular monitor to your laptop via HDMI or older VGA, DVI. If an image appears on another output device, then the problem is definitely in the backlight of the laptop display. Only a specialist can replace it, this is a difficult task.
Also, a black screen on a laptop can mean problems with the operating system or drivers. Often, returning to a previous system restore point, resetting it (in the case of using Windows 10), or a complete reinstallation helps. Finally, you can try resetting your BIOS settings. This is done blindly, because the laptop turns on, but the screen is black. Press the power button, then the key several times to start the BIOS. After a few seconds, press F9 to reset the settings, then F10 to exit and Enter to save. Depending on which laptop model you have (HP, Lenovo, Asus, Acer, etc.), the algorithm may be slightly different. you need to press the right or left arrow to select Yes or press the Y button to confirm. You can find out which button gives access to the BIOS from the instructions for a specific device.
What to do if the laptop screen is black but it works
If the laptop is noisy, the lights are on, but the display is NOT lit, then you can try to reset the settings according to these instructions:
Disconnect the device from the mains, remove the battery and hold down the start button for twenty seconds.
Reinstall the battery, connect the power supply.
Turn on the device in standard mode. After that, the settings should be reset.
If it does not help, then it is reasonable to check the display for performance. This check has already been described above: you need to connect another output device (monitor, TV) through the HDMI, DVI or VGA port. If the image is displayed on it, then the loop or backlight problems are obvious.
You can also disconnect all external devices from the device. a mouse, flash drives, an additional keyboard, headphones, modems, and so on. Probably, one of them conflicts and gives the indicated problem.
Why the laptop won’t turn on (black screen) but the lights are on
The main groups of reasons why such a problem may appear:
Damage to the south or north bridge of the motherboard due to overheating or mechanical stress.
Broken graphics card or processor.
Breakage or loss of RAM.
Problems with the hardware settings of the device.
Defective loops responsible for connecting the laptop matrix with the screen elements.
At some points you cannot do without replacing parts, and at some you can do it yourself. clean the fans from dust, eliminate Possible obstacles to air exhaust from internal components.
Additional methods for solving the problem
It is worth mentioning in the article a few more methods, which are considered extreme measures. They have to be resorted to extremely rarely, but this does not lead NOT to tell about them.
You can check the operation of the laptop hardware at the time of boot with the introduction of POST. a special card for self-testing. Its purpose is to determine the reason for stopping the download or the normal operation of any components, including the screen. POST cards are produced for laptops, which can be connected to USB or miniPCI connectors.
When the card is connected, when the device is turned on, codes will be displayed on its screen, each of which signals which component is being checked at the current time. As soon as a problem is encountered, POST displays information about it on the screen and stops working. From the instructions attached to the card, you can find out the decoding of the codes.
After turning on the black screen on the laptop. what to do
If, after starting the device, the indicators are on properly, the system boots, but suddenly at some stage a black screen appears, then the reason is most likely hardware-based and related to the battery. If the battery has failed, if there is a chance to partially restore it by applying a sawtooth voltage, but this is a difficult method. Easier to buy a new battery.
This problem is often faced by owners of rather old devices in which the battery is no longer able to fully hold a charge. If your laptop Lenovo, Acer or another brand is still new, then you should try to reinstall the system or immediately take the device to a service point.
What to do if the laptop does not turn on and a black screen is on
The main possible causes of this problem:
Mechanical damage to the device.
Liquid spills on internal components and contacts.
Inadequate cooling resulting in overheating.
RAM memory problems.
Incorrect component settings.
Damage to the display and related parts (matrix, loop).
Graphics accelerator issues causing black screen on laptop.
Many of these problems can be fixed at home with your own hands, but some are best left to professionals.
Why is the laptop screen black?
When turning on the laptop, a black screen may appear for software or hardware reasons. The users themselves, especially if they are a beginner, cannot always solve the problem, so we have prepared material designed to help with this. And if you prefer to trust specialists, then contact our company for laptop repair.
The laptop has a black screen, but the coolers start
One of the varieties of the problem is when, after booting the system, nothing is displayed except the cursor on a black background. This happens on older laptops and may be due to too old BIOS version of the motherboard. Why does this situation arise:
Windows 10 or other modern next-generation operating system automatically downloaded and installed new drivers for the graphics card;
The power control circuitry embedded in THESE new drivers is not able to function normally along with the old motherboard resources;
When the device is started, the monitor cannot fully display the image, although everything else works fine. you can hear the sound of the system starting, coolers make noise, the power indicator is on.
As a result, all the user can see is a black screen and a cursor on it. If you have an older Acer or Asus laptop, you can try closing and lifting the lid, often enough for the picture to appear. But your best bet is to update your BIOS firmware. To do this, go to the official website of the laptop manufacturer, find the “Files”, “Downloads” or “Support” section, and then download the appropriate update file. It always comes with step-by-step installation instructions.
Replacement of spare parts
If the POST-card is not available, but there are spare computer elements, then try replacing the one installed in the laptop with equivalent ones. Attention: do this only if you have a clear idea of how the laptop works, otherwise you can completely break it.
Change one element at a time and try to turn on the device. For example, RAM, hard drive, and so on.
What to do if, when you turn on the laptop, a black screen, but the light is on and the cooler is working?
In this article we will talk about such an unpleasant symptom for any laptop as a black screen when turned on. over, the light bulbs can burn and even the cooler will spin. But there will be no image on the screen.
Now you will learn what to do if you find yourself in a similar situation in order to try to bring the laptop back to life on your own at home.
Cleaning contacts of RAM
This is usually done easily. Unplug the laptop, disconnect the battery and turn it upside down.
Removing the cover for installing memory in a laptop
A cover should be present here, usually attached with a pair of bolts. It needs to be unscrewed and opened.
You should see something like this.
RAM sticks in a laptop
Small rectangular boards are RAM. They all need to be removed, metal holders should be tasted to the sides.
Removing RAM in a laptop
After removing, wipe the contacts with a regular eraser or alcohol and if there are several memory sticks, try to insert them one at a time, each time turning on the laptop.
The key is on the RAM bar. Wipe the contacts to the right and left to the end
Connecting an external monitor / TV
If, after the result described above, there is, then you need to try to display the image on an external monitor or TV in order to check the performance of the matrix and its loop.
VGA output in laptop for connecting an external monitor or TV
To do this, you will need any monitor or TV, as well as a cable that connects your desktop computer to the monitor. It is called VGA or HDMI.
HDMI output in a laptop for connecting an external monitor or TV
After connecting a monitor or TV to your laptop, try turning it on. If the image appears on the monitor, then you have a problem with the matrix or matrix cable.
Connect your laptop via an external monitor
Reset laptop settings and turn on without battery
The first step in such a situation is to disconnect the laptop from the network and then remove the battery.
Removing the battery from the laptop
Now without connecting it to the network and do not insert the battery, press the power button and hold it for about 30 seconds.
Laptop power button to hold
After that, connect the laptop to the mains without battery and try to turn on.
What makes this happen?
There may be several reasons for this laptop behavior. Starting from the lost BIOS settings (UEFI) and exit from the standing matrix (matrix cable), and ending with serious problems with the motherboard (north, south bridges, video card).
Now you will learn what you need to do in stages to diagnose and fix this problem.
If all else fails
In this case, with a high degree of probability, one can judge the failure of the north / south bridge and / or the video card.
For a temporary solution to the problem, some heat the released element with an industrial hairdryer. In this case, it is often possible to bring the laptop back to life, albeit not for long.
Laptop motherboard bridges and video card
The most correct option would be to replace the required chip with a new one, but this can only be done in a specialized workshop. The cost of such work usually ranges from 60 to 120.