The laptop does not turn on the light button is on

The power indicator is on, the laptop does not turn on: causes and elimination of the problem

laptop, does, turn, light, button

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? Sorting out all the issues that arise is actually not as easy 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 work. 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. 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 image 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 they will be able to repair the display. Usually, after such a repair, the devices do not work for long. Ultimately, you still have to replace your 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 a factory reset. Perhaps the BIOS settings are out of order. It is for this reason that the problem in question could arise on the laptop. In this situation, it is recommended to reset the BIOS and the computer should then be fully operational.

What else could have caused this problem? If we are talking about a new laptop that worked before, then we should not exclude 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 may be initializing. Probably, the laptop does not have RAM or a processor. If we are talking about a device that previously functioned, then the reason may lie in the breakdown 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 give your computer for repair. It should be borne in mind that most of these problems are usually solved with the help of a professional. 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 better to wait a few minutes before pressing the laptop power button. This will allow the battery to receive some power. This technique turns out to be quite effective. Some experts also recommend removing the battery from the laptop completely and then plugging the power cord into 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 outside help.

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 problem can appear when the laptop is damaged in the south or north bridge. Why does this situation arise? Bridge failures can be caused by various causes, such as short circuits due to 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 effect of viruses on the device. Often, a computer infection leads to the fact that the computer simply stops functioning normally. In some cases, it comes to BIOS damage by viruses. In this case, there may be problems with turning on the laptop. It is unlikely that you will be able to 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, you should not exclude it, especially in cases where the user himself admits the presence of viruses on the computer. In some cases, problems associated with turning 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 will bother you.

Let’s summarize preliminary results. To begin with, it is worth noting that diagnostics and troubleshooting in most cases boil down to calls to the service center. often than not, 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 stationary 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, it is imperative to inform the service center staff about it.

How to correctly count the Caps Lock indication

To correctly count Caps Lock signals, you need to observe the operation of the Caps Lock key indicator in order to identify “by eye” a pause between cycles and the number of light signals in a cycle.

In such a situation, immediately after pressing the Power button, there is a sequence of signals with an interval of about a second.

For correct counting, it is best to turn off the power with the button (holding for 3-4 seconds), then turn it on again and count.

When you turn on a Hewlett-Packard (HP) laptop, the power indicator lights up, the cooler rotates, the screen remains black, the Caps Lock flashes. laptop won’t turn on.

Turning on the indication (blinking) of the Caps Lock / Num Lock key in HP notebooks during startup is a diagnostic function. Often indicates the presence of serious damage to the motherboard (MB) or other modules: processor (CPU), memory (RAM), or problems in software (BIOS).

The Caps Lock indication can be used to determine the breakdown with a certain degree of accuracy for making decisions on repair and diagnostics.

Caps Lock / Num Lock Diagnostic Alarms Chart for HP Laptop

Caps Lock / Num Lock indication Test component Error
Caps Lock flashes 1 timeCpuCentral processing unit (CPU) defective
Caps Lock flashes 2 timesBIOSBIOS corruption
Caps Lock flashes 3 timesRAMMemory module (RAM) defective
Caps Lock flashes 4 timesGPUDefective graphics controller (GPU)
Caps Lock flashes 5 timesMBGeneral System Board Failure (Laptop Motherboard)
Caps Lock flashes 6 timesBIOSBIOS Authentication Failure
The indicator flashes cyclically. The number of indications in the cycle is counted. The time between cycles is detected “by eye” or 3-4 sec.
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What to do if the Caps Lock blinks and the laptop won’t turn on

If Caps Lock flashes 1 time. CPU error. It is best to check everything from the “removable iron”. Those. it is best to diagnose all laptop modules. it is possible that it is not the central processor that is out of order, but the indication indicates it.

It is best to diagnose modules like this:

  • We turn off the modules that are not critical for starting the laptop (HDD, SSD, WI-FI, DVD, second RAM bar);
  • We throw (if available) obviously working critical modules instead of those installed in the laptop (the first installed RAM, CPU).

If Caps Lock flashes 2 times. Damaged BIOS. Diagnostics at home most likely will not work. You can try to get-wipe the contacts of the RAM-insert in place of the memory. But the chances of getting a working laptop after that are very small.

This problem is solved by unsoldering the BIOS chip and flashing a new one using the programmer.

If Caps Lock flashes 3 times. Memory error. To fix: get and insert the installed memory strip or throw a known working new one.

If Caps Lock flashes 4 times. GPU error. Amateur repair is not possible. In the workshop, an engineer looks at the power supply and tests the video chip.

It is not always possible to diagnose the failure of a discrete laptop video card in this way: the indication is most often absent at all.

At the same time, the lack of indication cannot be proof of the performance of the laptop chipset.

If Caps Lock flashes 5 times. Motherboard failure. Most often this is a problem with the bridges (chipset) of the motherboard. For HP brand notebooks, the north bridge most often fails. This problem cannot be treated at home.

As a diagnostic procedure, a diagnostic warming up of the motherboard chipset bridge is carried out.

After warming up, as a rule, the laptop starts to start normally. The laptop can work normally after warming up from a day to 1-3 months. how lucky.

This happens due to the fact that the chip and contact balls have expanded. the contact has improved. there was a “temporary cure of the patient”.

For repairs with a guarantee of operability, it is necessary to replace the north bridge of the motherboard with the help of a professional infrared soldering station and special materials (high-quality flux, solder balls of a certain diameter, etc.).

Reballing a bridge is not as effective as replacing a chip. this is worth remembering when contacting any workshop.

If Caps Lock flashes 6 times. BIOS failure. We solder the BIOS chip, download the appropriate ROM, sew with the programmer. All this on special equipment.

For an accurate diagnosis, you need to contact a specialized laptop repair service.

Our workshop will tell you for sure why the laptop stopped turning on correctly. Naturally, repairs are also best done by professionals who can give a guarantee for the work done.

Battery problems

One of the possible reasons is that when you turn on the laptop, the indicators do not light up or the device does not charge. battery malfunction. It can be divided into several separate problems:

  • Broken battery. In most cases, it is easier and cheaper to replace it than to repair it. Batteries last an average of four years and then need to be replaced. Otherwise, the laptop will become an analogue of a regular computer that works only from an outlet.
  • The power supply is not powerful enough. It is necessary to choose a model that is fully compatible in characteristics.
  • There is a situation when the device operates freely from the battery, but cannot operate from the mains. The reasons lie either in a broken power socket, or in the failure of the controller. Rarely, but still it happens that the battery due to incompatibility with the device causes a failure on the motherboard.
  • Power circuit problem. Failure of the indoor module requires the mandatory intervention of the master. diagnostics on professional equipment is required.

Without professional skills and experience, it is better not to understand the laptop, and even more so not to touch the boards or contacts. unsuccessful action can lead to even more serious damage, and repairs will be more expensive.

The indicators on the laptop are off

If the indicators on the laptop are off and it is impossible to turn on the device, then you need to start by finding out the possible causes of the malfunction. The fact is that some problems can be fixed on their own without much difficulty, and some require the intervention of specialists.

Most often, the power supply chain is to blame for the situation. It contains protective elements: fuses and diodes. The former protect against short circuits, and the latter. from reverse voltage, which often occurs in the device if a non-native power supply is used for charging. The microcircuit that controls these protections often fails. multicontroller. Then laptop repair is inevitable.

Power button: why the power indicator on the laptop is not on

If the device does not turn on, or one press is not enough to turn it on, then there is a high probability that the power button is out of order. You can find new buttons on sale or take an old one from a donor computer. The quality of the components must be at a high level, and the installation is quite simple, no firmware is required.

  • Dismantling the keyboard. In Acer, it is not necessary to remove the keyboard, you need to pry the bar located in the upper part with a sharp object; in older models. snap off the two fasteners on the sides.
  • Removing the old part. Sometimes it is easy to dismantle, and sometimes it requires the use of tools. a set of screwdrivers, tweezers, a soldering iron. For HP brand laptops, the flex cable is easily disconnected without a soldering iron. Such contact is considered less reliable, but it leaves the possibility of quick replacement of the part. The board is disconnected through the largest white contact.
  • Fastening the new part into the corresponding slot. All dust, dirt or hair must be removed first.
  • Reassembly.

All loops and contacts must be well cleaned, without this the new spare part will not work. It is convenient to use a scalpel to strip the insulation. The cut off excess particles of the train may still come in handy, they are not thrown away.

The laptop does not turn on, the indicators are off: how is the multicontroller connected with this

The controller is a microcircuit that sends signals to power all components of the computer: USB buses, integrated video card, central processor, etc. The button responsible for turning on is also connected to it. When you press it, all tires are quickly checked for a short circuit, and then started. power supply to components.

The processor starts reading the code from the BIOS, then the operating system should start loading. But if we talk about the problem in question, then usually it never comes to boot: the indicators of the laptop do not light up when turned on, and the system does not work. The fact is that the LEDs indicating the health of the hard drive, keyboard and power supply are also controlled by the “cartoon”, even if not directly, but through other elements.

  • problems with the firmware of the chip;
  • water ingress;
  • power surge.

A non-working controller leads to the fact that the laptop charging indicators are off, and the device does not respond to button presses and does not start the operating system. Therefore, the part needs to be replaced. New “cartoons” are often sold without firmware, their installation takes a minimum of time. Other models need to be programmed before starting. the manufacturer writes the logical data necessary for operation into the flash memory. It takes time:

ManufacturerRepair termNote
Apple5 daysReplacing the SMC (System Management Controller)
Lenovo, Acer, Toshiba, Asus, Samsung, HP, etc.7 daysMost of the time is spent on preliminary diagnostics

There are a few more nuances to consider. For some models of laptops, the LED indication does not light up if the battery is disconnected. Then the wizard goes through the following steps when diagnosing:

  • Checks the charger connector and power input in the laptop. contacts may be dirty or broken.
  • Checks the functionality of the power button. If the power on the laptop is off and it does not start, then the button inside may have oxidized, the contacts cannot close to send a signal to the rest of the components.
  • Checks the system board for a short circuit.

And finally, it changes the controller if necessary.

How to determine that the cause is a short circuit

The laptop has several main buses for power: 12, 5, 3.3, or 1 volt. If one of them has a short circuit, then the external “symptoms” will be the same as when the multicontroller breaks down. There are many reasons for the appearance of a short circuit:

  • water ingress;
  • improper assembly (tightening the bolts too tight or squeezing the wire);
  • inconsistency of the incoming voltage;
  • breakdown in the circuit of lowering stabilizers of MOSFET keys, etc.

The master can check for a short circuit (short circuit) on the board. To do this, download the power scheme for a specific laptop. First, the 19-volt line (or other primary) is checked. Resistance to ground is measured: the more the better. If the resistance is underestimated, then find out its location. in the load or in the harness of the charger. If the short circuit is not in the load, then the laboratory power supply unit with current limitation will help; find which elements on the board are heating up and replace them. Using the same device, a short circuit is also searched for in the load, but before that it is advisable to remove all unnecessary from the board.

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Then the secondary power supply circuits are checked, namely the choke. The resistance here can be quite low, but this does not always mean a short circuit. the instructions for the platform indicate what the resistance should be on different elements.

Lights are flashing and the laptop is not working

In this case, the device can hum and create the appearance of working, but nothing is displayed on the screen. only black background.

If the hard disk indicator blinked a little and went out. this is a sign that the operating system is not even starting to boot. Perhaps it is a faulty motherboard, but this only applies to the case when the laptop does not have a separate modular video card. If it is, then it is required to diagnose it and, if necessary, replace or repair.

In addition, it is necessary to diagnose all devices that connect to the motherboard. processor, Wi-Fi module, hard disk, disk drive, etc. Any of them can create a conflict. Even if there was no problem before, contacts could fail over time.

By contacting our service center, you are guaranteed to receive service from professional craftsmen who will identify the problem as quickly as possible. And when the problem is identified, the client is informed about the estimated terms and prices.

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What is a multicontroller. what it does and how is it related to the indicator

If the power indicator is off, you should take a closer look at the multicontroller. We are talking about a chip that is located in a laptop. When it is in a faulty state, the LEDs do not light up. Voltage is supplied, but each module of the device has its own requirements. When the battery is charging successfully, it is worth making sure that the current flows to all modules.

An important point! Power can be supplied through a multicontroller or a daughter board.

Short circuit

If the laptop stops turning on, it may have a short circuit. Considering the electrical circuit, it is known that the power supply must be stable. The wire has two ends and the indicators on both sides may differ.

The main factor is electrostatic potential. An ASUS, Lenovo or other laptop will fail to start up when powered. It’s about potential energy.

Reasons why the power light is blinking:

  • Isolation is broken;
  • Damage to live parts.

If the indicators do not light up during a short circuit, the current strength changes. Before looking into solving the problem, it is worth considering the types of closures:

  • Single phase;
  • Two-phase;
  • Three-phase.

The exact type of closure can be identified during the promotion of the technique. When a Lenovo laptop does not respond to the tester, it is possible that one of the pins is touching the metal cover. The second problem is that the wiring without insulation is twisted together.

An important point! If the laptop does not charge and does not respond to commands, in such a situation, the problem can be solved on our own. It is better to untwist tangled wiring by hand, however, work is carried out when the equipment is disconnected from electricity.

  • Violation of the functionality of the circuit;
  • Wire melting;
  • Heat dissipation.

When the battery charging indicator on the laptop is off, you should be wary of a burning smell. If a short circuit occurs, there is a high risk of fire in the wiring.

The service center suggests the following steps to solve the problem:

  • Replacement of wiring;
  • Contact setting;
  • Cleaning of wires;
  • Insulation test.

The laptop does not turn on, the indicators are off: ways to solve the problem

If the laptop does not turn on, the indicators do not light up, you have to urgently solve the problem. Sometimes work remains unfinished or you need to check information on the network. In this case, you cannot hesitate, and you should immediately go to the instructions.

Power button malfunction

If the laptop does not turn on the first time, and in general, it is likely that the power button has ceased to function. Fortunately, new parts are being sold in the market and a new component can be selected. Some will choose to use a donor. Unlike a chip, you don’t have to do firmware. The difficulty with a used part can only be in the quality of components.

  • Removing the keyboard.
  • Release the cover.
  • Dismantling the old part.
  • Button installation.
  • Assembly.

When looking at an Acer laptop, the keyboard does not need to be removed. It is enough to pry the bar in the upper part. For this, a sharp object is used. Since we are talking about plastic, you should be careful with the clamps. If we consider the early Acer models, they use two mounts on the sides. The lid rises up to the silk.

  • Damage to plastic;
  • Sharp movement with the tool;
  • Prying off the lid from the top.

For many Lenovo, Acer, ASUS models, the panel is detached from the keyboard side. If you push a screwdriver away from the screen, then the probability of breaking the fastening and deforming the panel increases. After that, it is unrealistic to restore the element. When using a laptop, part of the board will be constantly visible. This not only looks terrible, but also shortens the life of the equipment. Dust will fly through the hole on the internal modules.

When the cover is removed, the Power indicator is visible. It is located at the top and a wire leaves the node. It is very small, so it will not be possible to pull the lid over a long distance.

  • Inspection of the attachment point.
  • Loop integrity check.
  • Fastener assessment.

When burned out, dark spots appear on the plume. Burns are also often seen directly on the board.

Input devices can be disconnected using the tools:

  • Tweezers;
  • Screwdriwer set;
  • Soldering iron.

If we consider an HP laptop, it does not have to be soldered thoroughly, a soldering iron is not required. On the one hand, it is practical and there is a possibility of quick replacement of the part. Fastening takes place due to a narrow clamp. On the other hand, contacts are considered to be unreliable.

An important fact! Soldered cables last much longer. The isolation level is higher.

  • Releasing the board from the input device.
  • Testing contacts.
  • Removing the power button.

The board is disconnected through the largest contact, most often it is white. Contacts are tested using a tester, multimeter. Experts recommend checking the elements in pairs. In this case, the device is transferred to the “resistance” mode. A short circuit indicates that the board can no longer be used.

  • Using a similar board;
  • Buying a new explorer.

With the board removed, you can inspect the power button socket. A lot of dust accumulates on the laptop, and it does not go unnoticed. Despite the modest size of the indicator, there may be a large tuft of hair under it, which prevents the button from working. The solution is obvious. remove all the trash.

  • The integrity of the loop is not checked;
  • Short Wiring Button Installation.

The contacts on the boards may be in good working order, but the loop produces errors. The probable reasons are attributed to mechanical stress, an increase in temperature. Cleaning is performed to solve the problem.

For the procedure, a complete analysis and inspection of the element is performed. The ribbon cable most often breaks near the power button.

  • Detaching a part.
  • Incision.
  • Removing the seal.

To remove the insulation, a previously prepared scalpel is used. The cut off part of the train is not thrown away, it will still come in handy. Adhesive is required in order to disconnect the contacts. For this purpose, the seal is brought to the contact. A small amount of glue is applied to the surface. If the end of the part is not cleaned, the new part will not take root.

Other options for malfunctions

If the laptop does not turn on, perhaps the reason lies in the following:

  • Short circuit;
  • Broken power buttons.

The first and second cases are not a verdict. When the laptop does not respond to the power button, it is not necessary to immediately carry it to the workshop.

Why are the indicators off?

HP laptop differs from Lenovo, Acer and it is problematic to indicate unambiguous reasons for the breakdown. The technique has individual characteristics and it is worth starting from this. If we consider, for example, a Lenovo laptop, the LED does not light up due to a disconnected battery.

An important fact! When the battery indicator is on, a special tool is used for the test in the workshop. The tester is installed on the AK and then the voltage that is supplied to the LEDs is determined.

When the laptop does not want to turn on, it is better to check the button. Give special vimani stit to contact.

  • Burnout;
  • Oxidation;
  • Breakdown.

The main cause of contact failure is moisture. For example, the technique can be poured with tea or juice. It was dried and everything worked fine, but contacts over time because of this tea became unusable.

The multicontroller is out of order

When the laptop does not respond to commands and does not turn on due to a faulty multicontroller, it is worth understanding the reasons:

  • Undervoltage;
  • Overheating of the board;
  • Increased humidity level.

For example, a Lenovo laptop is not responding and the tester shows that the voltage is lower than normal. This indicates that the multicontroller is not working properly. If the laptop does not turn on and has previously been in contact with water, the service center may tell you about the need to replace the element.

If the power indicator is off, the easiest way is to abandon this technique. An Acer laptop or another replacement may come in handy. However, valuable information can be stored on the equipment and the option is not suitable. When the controller is broken and the laptop does not turn on, many try to save money by installing a used item. You should be prepared for the fact that it will require firmware. The board works according to the specified parameters.

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If the power light is on but blinking, the controller is not running properly. It is clear that the firmware can only be carried out in a service center. When the power indicator does not respond and the problem lies with the controller, the best solution is to install a new analog.

The laptop does not turn on at all

Very often, the computer will not turn on at all due to power problems. But what if the laptop does not turn on, the power button is lit after pressing and nothing further happens. We’ll have to look for the cause and eliminate it.

Typical actions that cause a laptop to stop turning on:

  • dust cleaning;
  • update;
  • overheat.

If errors were made during the cleaning or updating process, then the behavior of the computer can be very different. Including the start may not occur at all. In addition, the system may not turn on due to problems with the hard disk and after overheating.

Included but

In some cases, the PC may turn on, but the download will stop at a certain point. At the same time, error messages may appear on the screen. In some cases, Windows does not start, in others it even fails to initialize.

After overheating

Modern computers generate a lot of heat during operation. In case of severe dustiness or a malfunction of the cooling system, overheating may occur, after which some parts may fail. As a rule, it is impossible to solve the problem on your own, you will have to contact the service center for this.

The main parts that can fail as a result of overheating:

  • CPU;
  • video card;
  • HDD;
  • north and south bridges.

After update

Problems may occur during the update. Failure to install updates correctly may cause the computer to stop turning on.

In this case, the user can install a new version of the BIOS, drivers or patches for the operating system.

The most difficult case is the inability to start the computer after updating the BIOS. This happens when the user tried to intervene in the process, for example, by restarting or shutting down the computer during it, or when using unofficial firmware.

Of course, it will not be superfluous to reset the settings to the standard ones. This can be done by removing the battery for a few minutes or by closing the corresponding jumper on the motherboard. But as practice shows, this probably will not help to fix the problem. The only way out is to contact the service center for repair.

In a situation where errors started after installing driver updates or Windows, you can simply roll back to a previous restore point from Safe Mode, reinstall the operating system, or return to the state it was at when you bought it, if this function is available in the model.

Causes of malfunction and their solutions

There can be a huge number of reasons why the laptop does not actually turn on. Many of them are quite simple and it will not be difficult to fix them on your own, but with some problems you will have to contact the service center.

Let’s take a look at the main reasons a mobile computer might stop starting:

  • nutritional problems;
  • problems with the hard drive;
  • malfunction of the video card or chipset microcircuits;
  • incorrect BIOS settings;
  • malfunctions of RAM;
  • overheat;
  • errors related to the operation of the operating system.

Comment. Very often, people say that the PC does not turn on at all, they mean that it does not boot
Windows. This is not entirely correct reasoning, but it is popular among ordinary users.

Defective hard drive

The hard drive stores all the information and the operating system of the computer. If it malfunctions, the computer can be turned on, but it freezes before the Windows splash screen appears. In some cases, an HDD error message may be displayed, for example, information that the disk is not a system one.

In any case, the user still has the opportunity to enter the BIOS SETUP menu. There you can check if the hard disk is detected and the correctness of the settings. If the hard drive is visible, then you can start the system from a boot disk or flash drive and test it.

What to do if, when you turn on the laptop, the screen is black, 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.

Connecting an external monitor / TV

If after the result described above there is no result, 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 a 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 the 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.

We connect a laptop via an external monitor

Cleaning contacts of RAM

This is usually easy to do. Power off 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.

Small rectangular boards are RAM. They all need to be removed by moving the metal holders aside.

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 to the left to the end

Why is this happening?

There may be several reasons for this behavior of the laptop. 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.

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.

Now without connecting it to the network and without inserting 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 network without a battery and try to turn on.

If all else fails

In this case, with a high degree of probability, one can judge about 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 hair dryer. In this case, it is often possible to bring the laptop back to life, albeit not for long.

Bridges and graphics card of laptop motherboard

The most correct option would be to replace the desired 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.