Lan port not working on laptop

LAN. technology and connector in one review: theory and difference from WAN

Boys and girls, I greet you! What is LAN? LAN stands for Local Area Network, as opposed to WAN. With you the Wi-FiGid portal and personally I, Botan, with clever terms. Bored? Nothing is clear? Then everything will be much simpler, chewed and on the shelves. I suggest you read this super article!

And if something suddenly remains incomprehensible, you can always write your question or wish in the commentary, and I or someone from our crazy team will definitely answer it.

Local network devices

The connecting link in the picture and in usually the apartment is a router (in another way, a router). It is he who creates a local network in himself, and all devices connected to it are included in this network. What is usually connected to it now:

  • Computer. via wire.
  • Laptop. usually via Wi-Fi.
  • Smartphones. via Wi-Fi.
  • Tablets. via Wi-Fi.
  • TVs. I have one on the wire, the other on Wi-Fi.

And these are the most typical representatives of the home network. And besides this, you can meet all sorts of switches, repeaters, smart sockets, video cameras, etc. All this is also in your LAN zone.

Connection and ports

Here I will talk about connecting to a LAN. There are 2 options:

  • Via Wi-Fi.
  • Through wire.

It is worth understanding here that everything revolves around the router. Everything that connects to the router is LAN. What the router connects to. WAN. As an incoming and outgoing connection.

The router itself can connect via Wi-Fi, but usually they still connect to it. Who connected. immediately gets into the local network. Another option is to connect over a wire. To do this, let’s take a look at the back side of any average router:

port, working, laptop

Pay attention to the LAN ports. there are usually several of them, and they are usually yellow (and then, and then not always). They are written LAN, or local area network or something else. It is difficult to confuse with others. The WAN port is specially taken out separately and allocated. Total. if you want to connect something to your local network. connect only to the LAN ports. If you want to connect your router to an ISP (for Internet access, 99% of cases) or another router (for example, for a perverse repeater mode). use the WAN interface.

Nowadays, both LAN ports and WAN ports usually have the same type of connector for an Ethernet twisted pair cable. RJ-45. But this may not always be the case. So an ADSL modem can be used for a local network RJ-45 (LAN), and for connecting to the Internet via a telephone cable. RJ-11 (WAN). The LAN connector is mostly all the more recent. RJ-45.

LAN. black ports, WAN. blue, there are 2 ports for telephony

Theory on fingers about LAN and LAN connector

So, let’s all over again, and we will gradually delve into the concept:

LAN. Local Area Network. Local area network. in the common people “Local network”

The key word here is “Local”. Those. separated from the outside world. Let’s keep it simple: here you are sitting in your apartment. this is a local space. And the street is a common space. So with networks. there is a local network, and there is an external global (Internet).

For reference. network. connecting devices via a network cable or Wi-Fi for data transfer. Who knows who did not know.

To simplify even further. any device in the network at home or in the office. a local network, the Internet. a global one. An ordinary person does not need to know more. Here’s an example of a typical home network:

LAN ports. ports on the router for access to the local network.

WAN and LAN. what’s the difference?!

LAN. Local Area Network. local area network
WAN. Wide Area Network

There is a broad sense and a narrow one. In a broad sense, I have already named the difference above. there is your home personal network, and there is a network to which all devices in the world can connect. the Internet. In a broad sense, WAN is the Internet. Basically, this is the difference and is asked everywhere in schools and universities. They ask for the main differences:

  • The size of the network. the Internet is ubiquitous (we are not even talking about the Earth, since it is also used in orbit, and in the future, it may be used on other planets, and this will not limit the WAN only to our globe), LAN network is limited apartment, office, enterprise network (key. not everywhere).
  • The number of users. again the difference is in the limited local network.
  • Services. local services (print, files), global services (WWW, global routing).
  • Topology. in LAN all are equal, connected to each other, Peer-to-Peer. WAN is characterized by client-server connections.

So, if someone asks you what is the difference between WAN and LAN. we list the points above, separated by commas and end the conversation. everyone will be definitely happy.

But there is one more thing related to technology. This is the WAN port. As a rule, the provider’s cable is connected to it. to connect to the Internet. The WAN port makes an outgoing connection in the router. And in this approach, the global concept of LAN and WAN in some cases can blur the boundaries between them)

In this case, an outgoing connection via WAN can also be connected to another router in your house (special cases). You cannot connect an external device via the WAN port without dancing with tambourines.

There is another type of networks. MAN (Metro Area Networks). This is something in between. a metropolitan or city network, perhaps a provider. Those. it is a kind of local network between all users, for example, one provider. The advantage is high speed between points. File sharing services used to live pretty well on this base.

HDMI not working on Windows 10 laptop

The laptop sees the connection, but there is no corresponding picture on the TV display

First, check the reliability of the connection, the HDMI cable should not hang out in the socket of the TV or laptop. Then carefully inspect the HDMI wire, if you find kinks or damage, think about replacing the wire, perhaps this way you will solve the problem.

If the wire is okay, then make sure you select the correct jack when connecting to your TV. The fact is that some TV models have several HDMI ports, and by default, the settings set to receive a signal from only one of them.

How to connect a TV to a computer via HDMI in Windows 10: detailed instructions

In the case when Wi-Fi Direct is not configured, Miracast is not supported, there is no flash drive with a large volume, and I really want to watch a movie in good quality, we remember the HDMI connector. a great way to duplicate an image to another device without losing quality. Therefore, the question arises: how to connect a TV to a computer via HDMI in Windows 10 and what is required for this? The answer is below.

Blank desktop is displayed after connecting to TV

In this case, the problem is not in the HDMI cable or connector, but in the fact that the TV acts as an extension of the laptop screen, that is, it is an additional area of ​​your desktop. In this mode, if you, for example, move any window to the right or left (depending on the settings), you will see it on the TV screen.

In order to switch the display to the duplicate mode, in which everything that happens on the laptop screen would be displayed on the TV display, do the following:

  • right-click on an empty area of ​​the desktop;
  • depending on the version of the operating system, select the line “Display settings” or “Screen resolution”;
  • if the TV display is not found, click the “Detect” button;
  • find the dropdown menu “Multiple displays”, select the value “Duplicate these screens” and then click “Apply”.
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Connection instructions

So, to transfer the image to TV, we need to connect two devices using a cable:

  • Turn off your TV and laptop. This must be done so as not to damage the contacts as a result of a possible spark.
  • Connect the ends of the HDMI cable to the input and output connectors (TV and laptop, respectively).
  • Turn on both devices.

Most likely, you will not see the projection of the laptop screen on the TV.

  • Enter the TV Menu and find the Input List item. It can also be called up by pressing the “Input” key on the remote control.
  • In the list that appears, click on the input source: HDMI.
  • After that, the image from the computer should appear on the TV.

But if this does not happen, the external signal transmission is disabled on the laptop or PC.

  • Press the WinP keys at the same time.
  • In the window that appears, select the type of projection.

The best way is the “Second Screen Only” option, in which the image from your machine will be accurately copied to the TV screen, while the computer display itself will remain off. Choosing a different connection will cause two monitors to work at the same time, which is distracting.

If your panel has a high resolution display, the transmitted image may be blurry or grainy.

To fully utilize the resources of the TV screen, you need:

  • Right click on the desktop.
  • Select “Screen Options”.
  • In the window that appears, click “Advanced display options”.
  • Then click on “Detect” and after displaying the parameters of the external screen, select the maximum resolution from the drop-down list.

Advice! If you do not have cable TV, and IPTV hits your wallet hard, you can watch TV through a computer: turn on online broadcast or sopcast on PC and broadcast the image on TV.

If the sound on the TV does not work when connected to Windows 10 via HDMI

Perhaps, after connecting the TV to the computer, the sound will not play from the TV speakers, but from the laptop speakers, or the connected speakers. This can be easily fixed.

Right-click on the volume control icon in the notification bar and select Playback Devices.

Your TV should be on the list. Right-click on it and select Set as default.

Sound will now be heard from your TV speakers.

Physical examination

The first thing you need to do is check the “USB port” for physical damage.

A simple test is to plug your “USB stick” into the port and see how easily the drive moves in the port connector. But be careful not to cause an additional hardware problem if you don’t already have one. If you don’t know how durable a “USB port” should be, do the same on the control port you know works and compare the two.

If the wobble amplitude is large enough and the connector is loose, then go to the end of this article, where we will talk about problems with the “USB port” hardware. Otherwise, continue with the following steps.

The USB port of the computer or laptop does not work, what to do?

Read how to diagnose and fix a broken USB port on your computer or laptop. Ways to solve the problem at home. Recently, the amount of information surrounding us has grown tremendously. We receive information from everywhere: personal computers, mobile phones, the Internet, television, radio, etc. The main types of professional activity are fully, or for the most part, transferred to the use of computer devices. Documentation, archives, correspondence, databases, etc this is only a small part of where personal computers are used. The main requirements for computer devices are their speed, reliability and the ability to store a large amount of information.

Reboot your computer

Before taking any steps, try the old technical troubleshooting method: turn off your computer and turn it on again. This sometimes helps by forcing the operating system to scan for hardware, such as a USB port, and restore it to work.

If this method did not work, then it’s time to use the “Device Manager” application.

Clear “Device Manager

There is a possibility that the Device Manager may display previously installed devices that are no longer connected to your computer. Sometimes device drivers remain installed on your computer long after the device has been turned off. It’s time to check and clean the Device Manager application by removing old and unused drivers.

If this method did not help you, then proceed to the next steps.

Disable “Option to temporarily disable USB port

The “Temporarily Disable USB Port Option” is a power saving option in the Windows operating system that suspends power supplied to a “USB device” to extend the battery life of the computer. This is a nice feature that allows you to save energy, but on rare occasions, this setting may block the connected USB device.

You can disable the “Temporarily disable USB port” option in two different ways: using the power options settings and through the “Registry Editor”.

Testing Universal Serial Bus Controllers “USB

The Device Manager application shows you all the categories of devices installed on your computer. At this point, you need to view the entries for the Universal Serial Bus controllers. Click on the arrow next to the USB Controllers section to expand the attached devices. You will see a list of available controllers, similar to our example:

This list will not really matter to you. However, it is important to pay attention to the following entry: “Intel (R) 7 Series / C216 Chipset Family USB Enhanced Host Controller”. This is a special type of “USB controller” directly for our computer, it will be different for you. But the keywords here are “USB Host Controller”. Find them in your Device Manager. If you cannot find them, then this may be your problem.

Checking the hardware configuration

Click the Update Hardware Configuration button on the Device Manager toolbar under the main menu ribbon shown in the figure below. This will force your computer to re-check all your hardware and update it. This may help and you will see “USB Host Controller” listed on your list. If the controller does not appear in the list, then the problem is not resolved.

What to do if USB on the front of the PC does not work

Another common situation is that all connectors are working properly, but connecting to USB on the front of the computer does not lead to anything. Almost always the reason for this is that these connectors are not cabled to the “internal” USB connector (pictured below) on the motherboard.

About this in detail and with photos in the second part of the instruction How to connect the connectors on the front of the computer to the motherboard.

USB ports not working on a Windows 10 computer or laptop. what to do?

One of the common problems on a PC or laptop with Windows 10 and previous versions of the system is the USB port does not work or all USB connectors at once. The reasons can be very different, but it can arise after installing Windows, changing PC components or without any specific preceding actions.

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This manual details what you can do to fix the situation when USB ports are not working, as well as what may be causing it.

If USB ports do not work after installing Windows

Most often, the problem with not working USB ports after installing the OS occurs for those users who install clean Windows 7 on a computer or laptop that only has USB 3.0 ports. The reason is the lack of appropriate drivers by default in 7-ka. However, similar problems can arise in Windows 10, especially when it comes to some unique hardware.

The general solution is to check if there are separate chipset and USB drivers on the official website of the laptop or PC motherboard manufacturer. If so, install them. For Windows 7, in the absence of an official driver, you can find generic USB 3.0 drivers on the Internet.

If specific devices are not connected via USB, as well as problems with cables, hubs and USB extenders

Often the user plugs in a particular USB device and, when it does not function normally, concludes that the USB port is not working. This is often not the case, and here I recommend trying:

  • Check if other flash drives, mouse, keyboard work with this USB port?
  • If you are using a hub (splitter) for the connection, try connecting the device directly to the USB connector.
  • If a cable is used to connect (for example, we connect a phone), try with a different cable. The bottom line: some USB cables do not serve for data transfer, but only for charging: for example, you can find these in a set with wireless headphones or some toys.
  • When connecting a device, check if a new device appears in the device manager with an error (exclamation mark)? If it appears, open its properties, look at the error code and search for it to solve the problem (including on this site), for example, the following are common: Device descriptor request failed (Code 43), Windows has stopped this device (Code 43), The driver is damaged or missing (Code 39), The device does not work correctly (Code 31).
  • The problem may also be in the USB connector on the device itself: malfunction, dirt or oxidation of the contacts can lead to the fact that it will not be visible in Windows (sometimes while continuing to charge or glow).

As a result, if we are talking about a specific device, I recommend looking for solutions specifically for this device: this will narrow the available set of options for the problem and the appropriate actions to fix it.

One or more USB connectors are not working

In the event that only one USB connector does not work on your computer or laptop, the first assumption is a malfunction (and it may be “inside” and a superficial examination will not reveal it), damaged, oxidized or dirty contacts of this connector.

It can also be a “burnt” port, which can sometimes be noticed by visual inspection of places inside a PC or laptop in the area where this connector is connected to the motherboard. Sometimes the USB controller chip may be damaged if it is not in the immediate vicinity of the connector itself. However, a visual inspection cannot always give a result and here it is worth contacting a workshop.

If a group of connectors does not work in your case, it can be either hardware damage to the USB controller chip, or simply the absence of original drivers for the USB controller from the manufacturer of the laptop or PC motherboard. In this case, I recommend downloading them from the manufacturer’s official website and installing them manually, and even if there are no drivers for Windows 10 on the website, feel free to install them for 7, 8 or 8.1.

Note: if you are in doubt as to whether the USB connector is a hardware problem or the system is installed, an easy way to check it is to make any bootable USB flash drive, plug it into this connector and check if it is visible in the BIOS. If so, is the download being performed from it? If the drive is visible, loading is in progress, then the hardware is in order, we are looking for a problem in the system, we install the original drivers on the chipset and, if available on the official website, on the USB controllers.

Additional manifestations of the problem and methods of correction

Finally, some additional possible ways to fix the problem:

  • If the problem appears after shutting down Windows 10, and if you run “Start”. “Restart”, USB works again, try disabling Fast Startup.
  • Check if the BIOS / UEFI of your computer or laptop has USB fast initialization, fast boot options. If so, try disabling them.
  • In Device Manager, under “USB Controllers”, check the properties of all USB hub devices and on the Power Management tab uncheck “Allow this device to be turned off to save power”.
  • If the problem appeared recently for no apparent reason, check if there are system restore points as of the date when everything worked, if any, use them.

In a situation where none of the proposed options turned out to be useful in your case, describe the details in the comments: perhaps I will be able to give a hint.

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Many thanks! very useful article.

It happens that when ESET antivirus is running, when Viber is installed, Avast antivirus is installed with it, which begins to block everything, including USB ports. You just need to remove this Avast and there will be happiness!

Good evening. Please help me very much. All done everything, as in many articles, nothing helps to solve the issue with USB ports. I even did a complete reinstallation of Windows and 8 and 10 do not work and that’s all.

And then there was a problem?
What hardware (motherboard or laptop)
Which ports are not working? (all, front, USB 3.0)
Any USB devices don’t work or, say, mouse / keyboard works?

Hello! I installed the DriverHub program to update drivers, for some reason I downloaded a driver called “unknown USB device”, after that the keyboard to which is connected via USB began to turn on and off, I pulled it out and removed the USB devices, after rebooting win10 I downloaded them again, but it did not help. now USB doesn’t work at all. It is not in the device manager, and the hub driver does not want to install anything and it did not do a restore point for this driver.

Download drivers manually from the motherboard manufacturer’s website, there should be a driver for the chipset and possibly a separate one for USB. install both.

New PC with Windows 10 preinstalled received in February. Everything worked fine, slowly mastered (81 years old). 03/12/2020 I get a surprise. the PC left unattended reported. the update is installed at 100%. And that’s all. the PC was left without control levers. the mouse and keyboard stopped working at the same time. When running the HP PC Hardware Diagnostics UEFI diagnostics, the keyboard and mouse are working properly. Diagnostic program verdict. all components are working properly, they are working normally.
On an old laptop with XP I study the Internet, but I can’t try all the recommendations, tk. I can’t control my computer without a mouse and keyboard. Tell me the way out.

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Attempts to reconnect the keyboard / mouse to other connectors were (and without any extension cords)?
How do flash drives behave if you connect them to this computer?

Mouse and keyboard work from all ports in diagnostic mode.
On a running system, when a flash drive is connected, a window opens with a flash drive, but there is nothing to open the flash drive. the mouse does not work.

Are there any other keyboards in the bins to try out? (I understand that this one is also working, but the other theoretically can tune in a new way, but USB works for us, if flash drives are opened).

Hello, after updating the BIOS on the laptop, the usb3.0 ports to which the keyboard and mouse were connected stopped working

And exactly the ports? Those. Flash drives do not work in them either? If so, see if there is a separate USB 3.0 driver on the laptop’s official website. If so, download and install. If not, then the chipset driver.

Good afternoon, I plugged the wire from the iPhone (without the iPhone) into the laptop and immediately the laptop turned off. The mouse stopped working after turning it back on. Despite the fact that in the device manager it is detected as a mouse and everything seems to be working properly, but it does not function. There are a couple of mice, none are working with this laptop now. What is the problem, as you think?

Apparently, initially it was due to problems with the USB connector on the laptop or the wire from the iPhone, when connected, something shorted (and maybe even something out of order). And in theory, it may turn out that it is not the wire that is to blame and not the connector itself, but some kind of garbage in the USB connector that can close the contacts.

Good afternoon, when booting into Windows, the mouse and keyboard are disabled. Everything works in the BIOS. help me please.

Hello. Check, and if you turn off the computer completely (by holding the power button for a long time), and then turn it on, does it work? If yes, then go through these points, and especially try to disable fast start:

Hello. Faced an unusual situation, all USB ports are working properly, but you can connect only one device. a keyboard or a mouse, while the second does not work. In this case, any port can be used, what to do in this situation

And somewhere else, not in the system, but for example, in the BIOS. how they behave?

The laptop does not see the network cable (internet cord). Reasons and what to do. Repair in St. Petersburg

Let’s look at the reason why the laptop does not see the network cable (Ethernet cable of the Internet) and try to fix the problem on our own.

Despite the widespread use of Wi-Fi, a wired network connection is still the simplest, most stable and reliable. The network cards of modern laptops are almost always supplied with preinstalled drivers: this means that most often, to connect to the Internet, you just need to plug the cable into the desired port. In practice, laptops sometimes refuse to recognize the wire, such a failure can occur for various reasons.

Diagnostics FREE.
7 (812) 953-94-11, 7 (921) 984-75-12 (Kamennoostrovsky prospect, 42, Petrogradskaya metro station)

Type of service provided Cost (rubles) Period of performance Guarantee period)
General table of for laptop repair
(not tied to a specific model)
Troubleshooting IS FREE 15 minutes to 2 days
Replacing the matrix laptop 15.6 “ 4500 to 10000 15 minutes to 2 days Up to 90 days
Replacing the laptop matrix 10.1 “ From 3500 15 minutes to 3 days Up to 90 days
Reballing or replacing the video chip (the problem is with the video card, there is no image) From 5500. 7500 1 to 10 days Up to 90 days
No backlighting of the screen (it will probably require repair or replacement of the inverter) 1500 to 3500 1 to 7 days Up to 45 days
Moisture has got under the cabinet (cleaning or replacing components) 1500 to 6500 2 to 7 days Up to 60 days
Replacing the keyboard (moisture got in, buttons damaged) From 3500.6500 1 to 3 days Up to 60 days
The laptop is getting hot / overheating (replacing thermal paste and cleaning the cooling system) 1700 1 to 5 days Up to 90 days
USB port not working (software errors) 1500 From 30 minutes to 1 day Up to 30 days
USB port does not work (repair / replacement of the south or north ports) 5000. 7500 2 to 4 days Up to 90 days
Replacing or repairing the charging connector (laptop won’t charge) 2500 From 40 minutes to 2 days Up to 60 days
Replacing the hard drive (laptop won’t boot) 4500-5500 1 to 2 days Up to 90 days
Reinstall Windows / Mac OS / Drivers (laptop buggy) 1500 1 hour to 2 days Up to 30 days
Saving information (recovery) From 1000 1 to 3 days
Please note: the table shows the general for laptop repair without reference to any model and manufacturer. details can be obtained from the employees of our service center.

Mechanical problems

The first thing to consider is the simplest option: try unplugging the cord and plugging it back in. Next, you should make sure that the plug is firmly inserted (until it clicks), check the wire for mechanical damage and make sure that there is a signal in the cable itself. It would be ideal to insert the cord into another computer, if there is no such problem on it, then it’s a laptop.

Inspect the contacts and the connection between the wires and the plastic plug; if a break is found, the cable should be replaced. It is cheap, but the replacement procedure itself may require the help of a professional if you need to pull the wire through the wall. Sometimes it helps to rewind the contacts with electrical tape, but this measure will not provide a reliable durable connection.


If the physical damage has been repaired and the laptop still cannot see the network, you should pay attention to the drivers. On modern operating systems such as Windows 7 and 8, reinstalling these software components is straightforward.

  • You need to press the WindowsR key combination, write devmgmt.msc in the console that appears and press “Enter”.
  • After that, a list of all available devices will open, where in the category “Network adapters” you can find the installed network cards. Usually their names contain the name of the manufacturer’s brand, for example, Intel or Realtek.
  • By right-clicking on the device, you need to click the “Delete” button in the menu that opens.
  • When you reboot, the system itself will find the necessary drivers and install them.

For old laptops, it is important to install drivers from disks that usually come in the kit, in some cases they can also be downloaded from the network. A characteristic sign of a network cable is a green signal on the plug, although the presence of a glow does not guarantee that the cable is working correctly.

The absence of visible changes after all procedures usually means the failure of the controller or port. Repair or replacement of a network card in a laptop should be entrusted to a specialist.