Can't find usb connection. The computer does not see USB devices, what should I do? Repair of computers and laptops. The culprit of the failure is the computer. What to do

Every computer and flash drive user has at least once found himself in a situation where the flash drive failed. That is, it is impossible to view the information that is stored on it. The flash drive does not work, the computer does not see the flash drive, files are either not written, or are not transferred from the flash drive, or it shows a discrepancy in the storage capacity of the storage device.

But first things first.

The computer does not see the flash drive

In fact, there are a lot of problems that affect the computer’s detection of a flash drive - even the version of the operating system itself.

And so, you inserted a flash drive into the computer, it is not detected. How does this manifest itself?

The computer tells you what you need " insert disk" Even when you did.

The computer writes that the disk needs to be formatted because it is not formatted;

A data error has occurred;

The computer freezes when a flash drive is inserted;

The device is not recognized.

Now you will read a short instruction on how to solve the problem when the computer does not see the flash drive. But that doesn't mean that this instruction will help you 100%. If one method does not help, move on to another until the problem goes away.

Go!

The first thing you can do is check whether the utility sees " disk management» your flash drive. To do this, run this very utility:

Click Start → Execute (Win+R)→ enter → diskmgmt.msc→ press Enter. OR

Control panel → Administration → Computer management → Disk management.

In the disk management window, pay attention to what happens when you connect and disconnect a flash drive to the computer - does the disk disappear and appear again, or not?

The best option is when the computer sees the flash drive, and all the partitions on it are in the “ OK" If this is the case, then do the following: right-click on it and select “ make the section active" You may need to assign a letter to the partition.

Well, in principle, this will be enough for the computer to see the flash drive.

Well, what if suddenly this utility displays the message “ Unknown" or " Not initialized", as well as one partition in the state " Not distributed", this will mean that the flash drive is damaged. Therefore, the computer does not see the flash drive. You need to perform data recovery (more on this later).

If you connect your flash drive through an extension cord or USB hub, then try connecting it directly. Also try connecting to all available USB ports. Next, as an option, you can turn off and restart the computer, disconnect other devices from the computer (well, except for the keyboard and mouse, of course), and then restart the computer. In this case, if the flash drive is detected and starts working, then the problem is obviously in the power supply to the USB ports, there is simply not enough power. There is only one piece of advice - replace the power supply with a more powerful one.

Option to remove old drivers

Use this option when the computer does not see the flash drive and writes “ Insert disc", provided that the flash drive is already inserted. This problem and more can be caused by old drivers that are available in Windows. For example, when you connect a flash drive to your computer, your PC turns off or reboots.

The reason is that Windows installs drivers for flash drives the first time you connect them to the port, and when you unplug the flash drive, the drivers remain in the system and do not go anywhere. Then you connect a new flash drive, a conflict arises, which is caused by the reaction of Windows when trying to use the old driver that was installed when connecting the first flash drive.

How to remove old drivers?

First, turn off the computer. Disconnect all memory devices and peripherals and accessories from it.

Turn on your computer.

Download the utility DriveCleanup.

We copy, depending on your Windows versions, 32 or 64 bit version drivecleanup.exe to daddy C:\Windows\System32.

Let's launch command line as administrator (right mouse button on menu " Start") and enter drivecleanup.exe . Click Enter and watch as the computer deletes all drivers and entries.

After the removal is complete, simply restart your computer, insert a new USB flash drive and Windows will install new drivers on it.

USB device not recognized

When you connect a flash drive, printer or any other device that connects via USB in Windows 7 and Windows 8.1, and you see an error, an unidentified device - read these instructions and we will try to figure it out.

There are actually many reasons why Windows cannot recognize a USB device, and therefore there are also quite a few solutions.

The device is not recognized. What to do?

If you encounter a problem when you insert a USB flash drive and a message appears that you have connected an unidentified device when connecting any device via USB, make sure that the USB itself is in good condition. This will save you and me time. To make sure the USB plug is working properly, you can try connecting it to another computer or laptop. If everything also does not work, then the problem is in the device itself. If it works, read on.

This method is for those cases where the device previously worked without comment. Everything was determined.

We disconnect our USB device, which the computer cannot recognize, disconnect all devices that we do not need at the moment, and connect a device that is not recognized to the rear panel system unit and see if the problem is resolved.

Correction of the message " Device not recognized" through Device Manager and USB Drivers.

Let's go to device Manager(press Win + R keys) enter devmgmt.msc what field do we click on? Enter.

The connected device will most likely be in the list USB controllers or Other devices(and be called " Unknown device»).

If it is in the list with other devices and you are connected to the Internet, you can right-click on it and press the button update drivers.

If an unidentified device is still in the list USB controllers, then right-click on it, and on the Driver tab, click the button roll back or Delete.

Another option is in the USB properties in the “ Power management» uncheck the box « Allow this device to turn off to save power».

You can also try for all devices that are in the " USB controllers» do the following:

Click " Update driver».

Click search for drivers on this computer.

Select a driver from the list of already installed drivers.

In the list you will see that there is a driver that is compatible with the device. Select it and click " Further" The driver will be installed, after which the computer may recognize the device.

In Windows 8.1, this problem occurs with external hard drives and flash drives that operate from a USB 3.0 port.

This problem can be solved in the menu for managing the parameters of the laptop power supply circuits.

To do this, go to the panel Windows management in the power section, select the power plan you are using and click “Change advanced power settings.” In the USB settings, you need to disable temporarily disabling USB ports.

It happens that when you turn on your computer, you suddenly notice that the mouse does not respond to your movements. This can happen with both a wired USB and a wireless mouse. Usually, the reasons for this are similar cases and are already known to many specialists. Therefore, we will look at all the most popular reasons why the computer does not see the mouse and will present in the article several solutions that should definitely help you.

First of all, your task is to determine whether your reasons for a non-working mouse are primitive.

Ways to solve a problem with a USB mouse

If the problem occurs with a mouse that is connected via a USB port and the computer does not see it when turned on:

• Disconnect the mouse's USB connector from the computer panel and turn off the computer. Disconnect it from the network and press the power button on the computer for a few seconds - this way you will completely clear the computer modules of charges, primarily the motherboard.
• Now turn on your computer and connect your mouse after Windows startup. The mouse should work.

Now let's fix the problem with the USB mouse using . This method is appropriate when the system does not recognize such a device in the device manager of your PC. To open the device manager, right-click on the “My Computer” icon and select the appropriate item or through the command line WIN + R and enter the command “Devmgmt.msc” and press Enter.

You will find the device in the body of the list, it will look like “USB Controllers” or “Other Devices” (“Unknown Device”). If it appears as an unidentified device in your list, then you need to right-click on it and select “Update drivers”. In this case, the system automatically finds the necessary drivers on the network and installs them without your intervention. After this installation, you can use a working mouse.

If there is an exclamation mark next to our mouse in the task manager:

Physical damage due to which the computer does not see the mouse

If used carelessly, even a USB connector can become unusable. Check the contacts on the port and in the mouse connector; they may be damaged, bent, or worn out. Although the USB connector is very wear-resistant, it could still break with active use, and the contacts could also become loose. In this case, you need to contact a service to replace the USB ports on the motherboard or purchase a new one.

The mouse cable may also suffer from any kind of damage that leads to broken wires inside the cable. There are cases where they are chewed by domestic animals. In this case, the system will notify you with the message “Unable to connect to the USB port” or. The USB cable has 5 cores, which are not so easy to reconnect together. This is probably the easiest place to buy a new mouse. If the model is expensive, the service can save it.

In addition to the wire, damage can also occur in the mouse body itself.

Main faults inside the case:

• The surface of the lens is dirty and scratched.
• Buttons don't work. The arrow runs across the monitor, but click commands are not executed.
• The main board, reader, photocells, etc. are faulty.
• The wheel control controller is faulty. In this case, it is not possible to scroll pages up and down.
• Front USB ports are unreliable. When several ports are connected to the same microcontroller board. It happens that inexperienced users connect several 4G modems and printers to such ports at the same time - if a failure does not happen, it will definitely happen. Modems will often lose the cellular network and periodically drop the connection. The same will happen with the printer; it will slow down in every possible way, stopping without finishing the document. The USB mouse may not be recognized by the system. As you may have guessed, you need to distribute the equipment across all USB ports of the computer, including on the back panel.

In wireless mice:

USB 3.0 laptop does not see mouse

Laptops running operating system 8.1 often encounter the “USB device is not recognized” error. To prevent this problem? It is necessary to change the power supply circuit of the laptop.

Problems with the mouse on different devices and versions of Windows

After reinstalled Windows systems Chipset driver incompatibility may result in the mouse not working. Each operating system includes drivers for the sensor, mouse, and touchpad, except MS-DOS. A common reason for a mouse not to work is a non-working USB driver, component – ​​“Serial Bus Controller” and “Root Hub”. You need to find on the Internet the version of the chipset that is suitable for the version of Windows OS that you currently have installed. Although for versions 8.1/10 the main drivers are already provided as system components, it is not necessary to install them separately.

ACER netbooks, which are provided with Windows 7 by the manufacturer, when installing versions above, a problem appeared - the mouse did not work. The problem was in the netbook hardware - the Windows 7 chipset drivers were not suitable and the following problems arose: the wireless network connection disappeared, the sensor did not work, the mouse did not work (the pointer was in one place). The problem was solved by removing the drivers and restarting the operating system. Devices and equipment were working normally again.

Error - device not recognized, one of the most frequently encountered failures in Windows OS, there may be several reasons for it:

Causes and solutions

If your flash drive is really broken, then fixing it will be practically impossible. To check if it is broken, just insert it into the USB connector and wait for the computer to react; if no sound was heard and the USB device itself did not start to glow, it broken.

You can try it repair taking it to a service center, where specialists can solder the contacts. But it is prudent to take it there only if you have very important files and documents stored on the flash drive, because... The repair procedure is not cheap and will be much simpler buy new.

But you shouldn’t immediately rush to take it to the service center. Maybe, connector flash device is clogged. This also happens. To fix it, just take a cotton swab and dip it in alcohol. wipe contacts.

Sometimes it happens that the computer assigns your device with the letter of another device, that is, it changes its location.

To fix this problem, you need to go to Start – Execute– and enter the command diskmgmt.msc

Will open control manager disks.

Here it is necessary find your device, right-click on it and select “ change drive letter or the path to the disk...".

Select unique letter which is not yet occupied by any of your devices.

If the previous step did not help, in the same menu, right-click on the flash device and select “ Format", then you should format it, first replacing NTFS with FAT 32. By selecting another file system the problem may go away.

Problems with drivers are considered the simplest. If your computer cannot detect your device due to lack of driver support, you should delete drivers and then restart device.

If connection problems are related to socket failure, you can try inserting the flash drive into another connector or device, If she earned- it's in the nest.

Sometimes there are situations when the front connectors do not work. In this case, you need to remove the cover and get close to motherboard.

If everything is the same as in the image, call a specialist, you will have not connected front USB connector.

You should not try to connect contacts alone, because the slightest mistake can lead to breakdown computer.

Sometimes the problem is that the USB is simply not functioning. You can fix this by going to BIOS. To do this, when you turn on the computer, quickly press one of the keys “ F2», « F11" or " DEL", each computer is different.

After this you should go to Advanced -USBConfiguration.

Make sure you're near USB 2.0Controller will [ Enabled].

We have covered all the key solutions to the problems. There are other problems, but the methods outlined in this article can solve them all.

Today, USB is one of the most common data transfer protocols between a computer and a connected device. Therefore, it is very unpleasant when the system does not see devices connected to the corresponding connector. Especially many problems arise if interaction with a keyboard or mouse occurs on a PC via USB. Let's figure out what factors cause this problem and determine methods to eliminate it.

In this article we will not discuss problems with the visibility of the device associated with its inoperability, because in this case this equipment should be replaced or repaired. The article will concern cases where the problem is caused by malfunctions or incorrect settings of the system or PC hardware. In fact, there can be many reasons for such a malfunction, and each of them has its own solution algorithm. We'll talk about specific ways to fix this problem below.

Method 1: Microsoft Utility

In many cases, a specially created utility from Microsoft can solve the problem with the visibility of USB devices.

Method 2: "Device Manager"

Sometimes an issue with USB hardware visibility can be resolved by simply updating the configuration in "Device Manager".

1. Click "Start". Click "Control Panel".



2. Come in "System and safety".



3. Now open "Device Manager" by clicking on the corresponding inscription in the block "System".



4. The interface will launch "Device Manager". The problematic device in the list can either be displayed in a block "Other devices", or absent altogether. In the first case, click on the block name.



5. A list of devices will open. Problematic equipment may be indicated there either under its real name or listed as "USB Mass Storage Device". Click on its name with the right mouse button ( RMB) and select "Update configuration...".



6. Device search will be activated.



7. After it is completed and the configuration is updated, it is quite possible that the system will begin to interact normally with the problematic device.

If the required equipment is not displayed at all in "Device Manager", click on the menu item "Action" and then select "Update configuration...". After this, a procedure similar to that described just above will occur.

Method 3: Update or reinstall drivers

If the computer does not see only a certain USB device, then there is a possibility that the problem is due to incorrect installation of drivers. In this case, they need to be reinstalled or updated.

If this option does not help, then there is another method.

1. Click in "Device Manager" by device name RMB. Select "Properties".



2. Go to the tab "Driver".



3. Click on the button "Roll back". If it is not active, click "Delete".



4. Next, you should indicate your intentions by pressing the button "OK" in the dialog box that appears.



5. The procedure for removing the selected driver will be performed. Next, click on the position in the horizontal menu of the window "Action". Select from the list "Update configuration...".



6. Now the device name should appear in the window again "Device Manager". You can check its functionality.

If the system was unable to find the appropriate drivers or the problem was not solved after installing them, then you can use the services of specialized programs for searching and installing drivers. They are good because they will find matches on the Internet for all devices connected to the PC and perform automatic installation.

Method 4: Setting up USB controllers

Another option that can help solve the problem under study is setting up USB controllers. It is still performed in the same place, that is, in "Device Manager".

If this does not help, then you can reinstall the drivers for the group elements listed above "USB Controllers", using the same methods that were described in the presentation Method 3.

Method 5: Troubleshooting the port

It is possible that your computer does not see USB devices simply because its corresponding port is faulty. In order to find out if this is so, if your desktop PC or laptop has several USB ports, try connecting the equipment through a different connector. If this time the connection is successful, it means that the problem is in the port.

To resolve this problem, you need to open the system unit and see if this port is connected to the motherboard. If it is not connected, then connect. If there was mechanical damage or another failure of the connector, then in this case it is necessary to replace it with a working version.

Method 6: Relieving Static Stress

In addition, you can try to remove static tension from motherboard and other PC components, which may also cause the problem we are describing.

There is also a possibility that the computer does not see the equipment due to the fact that many USB devices are already connected to it. The system simply cannot cope with such a load. In this case, we recommend that you disconnect all other devices and connect the problematic equipment to the back of the system unit if there is an appropriate connector there. Perhaps this recommendation will help solve the problem.

Method 7: Disk Management

Problem with the visibility of the connected USB device, in this case exclusively a flash drive or external hard drive, can be solved using the built-in tool of the system "Disk Management".

1. Click Win+R. Enter in the field of the shell that appears:

   Apply by pressing "OK".



2. The tool interface starts "Disk Management". You need to monitor whether the name of the flash drive appears and disappears in the window when it is connected to the computer and disconnected. If nothing new happens visually at all, then this method will not suit you and you need to solve the problem using other methods. If changes occur in the list of connected drives when attaching new media, then you can try to solve the problem with visibility using this tool. If next to the name of the disk device there is an inscription "Not distributed", then click on it RMB. Next, select "Create a simple volume...".



3. Will start "Simple Volume Creation Wizard...". Click "Further".



4. Then a window will open where you need to specify the volume size. Since in our case we need the volume size to be equal to the size of the entire disk, then click here too "Further" without making changes.



5. The next window requires you to assign a drive letter. In the corresponding field, select a character that differs from those letters that are already assigned to other drives in the system. Click "Further".



6. The following settings window opens. Here in the field "Volume Label" You can enter a name that will be assigned to the current volume. Although, this is not necessary, since you can leave the default name. Click "Further".



7. The next window will provide a summary of all the data entered in the previous steps. To complete the procedure, just click on the button "Ready".



8. After this, the volume name and status will appear opposite the media name "Fixed". Next click on it RMB and select “Make partition active”.



9. Now the computer should see the flash drive or external HDD. If this does not happen, then restart your PC.

There are situations when when opening a tool "Disk Management", the volume that belongs to the flash drive already has the status "Good". In this case, there is no need to create a new volume, but only those manipulations that are described starting from point 8 need to be performed.

If, when opening the tool "Disk Management" you see that the disk is not initialized and has a single volume that is not allocated, this means that, most likely, this drive is physically damaged.

Method 8: Setting up the power supply

You can solve the problem with the visibility of USB devices by making some manipulations in the power settings. This method especially often helps when using laptops that interact with connected equipment via the USB 3.0 protocol.

1. Go to "Control Panel" and then to the section "System and safety". We discussed how to do this during analysis. Method 2. Go here by position "Power supply".



2. In the window that opens, find the current power plan. There should be an active radio button next to its name. Click on the position "Setting up a power plan" near the named position.



3. In the shell that appears, click “Change advanced settings...”.



4. In the window that appears, click "USB Settings".



5. Click on the inscription "Temporary shutdown option...".



6. The specified option will open. If the value is specified there "Allowed", then you should change it. To do this, click on the indicated inscription.



7. From the drop-down list, select "Forbidden" and then click "Apply" And "OK".

Now you can check whether USB devices will work on this PC or whether you need to move on to other ways to solve the problem.

Method 9: Eliminating the virus

We should not exclude the possibility that the problem with the visibility of USB devices arose as a result of a virus infection of the computer. The fact is that some viruses specifically block USB ports so that they cannot be detected using an anti-virus utility connected from a flash drive. But what to do in this situation, because if the standard antivirus missed malicious code, then it is now of little use, but you can’t connect an external scanner for the above reason?

In this case, you can scan the hard drive with an anti-virus utility from another computer or use a LiveCD. There are quite a few programs designed for these purposes, and each of them has its own nuances of operation and management. But there is no point in going into detail about each of them, since most of them have an intuitive interface. The main thing when detecting a virus is to follow the prompts that the utility displays. In addition, our website has a separate article dedicated to such programs.

There are quite a few ways to restore the visibility of USB devices in Windows 7, but this does not mean that all of them will be effective in your particular case. Often you have to try many options before finding the right way to solve the problem.

There are cases when you connect your phone to a personal computer or laptop via a USB cable, the first one does not recognize it. It becomes impossible to reload files from your phone to your computer and vice versa. It's a shame.

However, there are ways to recognize the cause of this type of incident and ways to correct it. If your phone is not just a mobile phone, but a gadget with an operating system, then reloading files via USB is not possible in the usual way, i.e. The phone is no longer like an ordinary flash drive - it is a computer itself. In order to transfer files from your phone, you will have to either reflash it or send files by mail.

I recently encountered a similar problem on my phone Samsung Galaxy: Until the gadget was configured in computer mode, reading files and downloading them to a PC via a USB connection was impossible; after “resetting” this became impossible.

However, there are cases when the phone operates in normal mode and acts as a flash drive, but the PC still does not “see” it. Why? What can you do in this case to try to fix the problem. Read below.

Music, movies, photos, applications - all this is simply necessary for a modern person in his phone. Without communication with a PC, the mobile phone will sharply lose its functionality. Close interaction is ensured through a connection via a USB cable or via Bluetooth. Since file transfer via Bluetooth is quite slow, the USB connection is the most common.

But the user, having decided to use data transfer via a USB connection, suddenly cannot do this. Understanding his disappointment, let's give him some advice. To do this, consider two options: when the computer does not respond to the mobile connection at all, and also if the phone is detected as an unknown device. So, now in more detail.

How to detect a problem

When you connect to the computer, your phone is not detected in any way, nothing lights up on it, and there is no message on the monitor about connecting the device. This is a fairly common malfunction, with several causes. Let's try to list them and give recommendations for eliminating this problem. This assumes that the USB port you are connecting to is working. That is, other devices work normally through it.

1. If the phone used to connect normally, but then suddenly it didn’t want to, then you should, first of all, suspect the quality of its connection to the computer. Try removing the connection cable from both the mobile and the USB input and then reconnecting them. It often happens that the contacts of the telephone connector simply become loose or dirty. This problem is inherent to a greater extent in the brand. Sony Ericsson, whose models stand out on the market mobile communications a completely illiterate and often faulty connector.

Tip: if possible, try to clean the telephone connector with an eraser, after which remove any remaining rubber from the surface of the contacts.

If cleaning does not help, then connect the phone via another USB cable. Take it from friends or relatives. Cable failure is not the most common cause of trouble, but this option also needs to be taken into account. If it helps, then you just need to buy a new accessory.

2. Restart your computer. Oddly enough, this method helps in most cases without any additional measures. The reboot process resets the system settings and redefines the USB ports. By the way, when the computer does not see the tablet, the best way to help is to restart the computer, as is the case with the phone.

3. Rebooting your PC didn't help? Then, to be on the safe side, restart your mobile phone. Unplug it, remove the battery for 10 minutes, and then put it back in. Turn on the device. Nothing happens? Go ahead.

4. Disconnect the cable from one USB and connect it to another USB input. This simple action often helps, since the computer sometimes confuses the ports. To ensure that the OS sees the connection, you can use the following method. Go to Device Manager and find a list of used ports there. Typically this information includes all USB bus controllers. Open the list. In it you can see all the working ports of the computer. Find in this list the port to which the phone is currently connected (this can be seen in the “Power” column). All other ports, except the one found, can be temporarily disabled. The computer will have no choice but to see your mobile.

There is, of course, the possibility of a breakdown of the phone itself or its connector. This is the most difficult option, in which you cannot do without contacting a service center. There they will be able to tell you exactly why the computer does not see the phone and how to fix it.

USB device not recognized

We go further, considering the second case, in which the computer identifies the phone as an unidentified device. Of course, work with unknown device The OS doesn't want to. And the question is not that Windows itself is imperfect, because the same problems often arise with Linux and other operating systems. Therefore, we must help the computer identify our mobile phone. We list the reasons for this phenomenon and possible user actions:

The problem may be with the phone itself. Connect the device to another computer. If the problem persists, then the reason lies within mobile device. You may need to enable one of the computer connection modes in the settings. For example, the “Data transfer” or “Storage” mode. Experiment with these modes;

Tip: Check your phone settings. In some mobile models, you must manually enable synchronization mode, which is disabled by default. Or disable the current blocking. If there is a blocking, open access must be established.

a) restart your PC and phone as described in section 1;

b) often the mobile phone is not recognized by the OS in case of lack of power supply. If you connect the phone to the front computer panel, then try connecting it directly to the motherboard, into the USB slot located on the back of the system unit;

Tip: In the Device Manager section, find the port you are using and open the Power Options tab. Check to see if the “Allow device to turn off to save power” checkbox is unchecked. If the checkbox is checked, remove it.

Sometimes crashes occur in the OS, as a result of which the “native” drivers of some devices are lost. Reinstalling drivers for the motherboard and connected devices helps solve the problem. If your phone came with a driver disk, use it to connect the device;

Tip: You can check whether your device needs drivers in Device Manager. If there is a yellow question mark before the device name, you can conclude that there are no drivers for this plug-in. How can you determine that an unidentified device is a mobile phone? Very simple. Disconnect it from your computer and the question mark will disappear.

We also cannot exclude the possibility of the OS being infected by a virus that sets its own rules on the computer. Check all drives (including system) good antivirus with current databases.

If none of the above helped you, and there is still no connection between your mobile phone and your computer, then you can use a radical treatment. If the phone is detected perfectly on another PC, then the cause of the problem most likely lies in operating system. You'll have to reinstall the system. Then everything will surely work. Moreover, such errors in the system accumulate gradually, it is impossible not to notice. Thus, reinstalling the software will not only solve the issue of connecting the phone, but will also eliminate other possible errors.