When connected to your computer or laptop mobile phone, flash drives, external hard drive, printer, scanner, or any other device through the universal serial bus, you may encounter a very common error - USB device not recognized with the comment "One of the devices connected to this computer is not working properly or cannot be detected." It is found both in Windows 7 and on the most modern version of the Microsoft operating system - Windows 10. It looks like this:

In English versions, this is a "USB Device Not Recognized" error:

Why this error appears and what are the ways to fix and eliminate it - we'll talk today.

Reason 1. Cables, extension cords and hubs

The low quality of cheap USB cables, adapters and splitters (aka “hubs”) are the most common source of various problems for devices connected via the universal bus. Therefore, when the error “USB device not recognized” appears, the first thing to try to do is to exclude the intermediate link in the video extension or hub. That is, we connect a flash drive, a 3G / 4G modem and similar things directly to the USB port on motherboard computer. The front connectors on the case of the system unit will also not work because they are just as often the cause of a malfunction, which means they should not be “trusted”.

In the case of a printer or scanner, pay attention to the integrity of the cable. If there is visible damage, use a different cable. It is inexpensive and it will not thin your budget at all.

Reason 2. Faulty USB port

The second very common cause of work problems external devices- physical damage or even breakage of the USB port. It's a paradox, but often people who wash two or three times a day do not at all monitor the cleanliness of the equipment with which they communicate every day. Particularly affected by this system blocks. They are often liked to be "pushed" into the dustiest and dirtiest corner. As a result, dust accumulates in all possible places, including USB ports. I even happened to find mummies of various beetles and insects there. Yes, and contamination of contacts also does not contribute stable work connector. In addition, there were cases when users stuck a mouse, printer or USB flash drive so zealously that they simply broke the port.

Therefore, if the error “One of the devices connected to this computer is not working properly” appears, carefully inspect the connectors for contamination or damage to the contacts. Try switching to the next one and see if there are any errors on it. In addition, it is worth opening the Device Manager and looking at the USB controllers to see if any of them are worth a red cross. This usually indicates that it is out of order and the motherboard needs to be repaired. Sometimes, however, it saves the installation of an additional controller in the PCI slot.

Reason 3. Drivers and software failure

Problems installing a driver for a particular gadget is another possible cause windows errors"USB device not recognized." If you open the Device Manager, then in the list that appears, you will see a yellow triangular icon in the list of controllers.

In this case, it will be signed as "Unknown USB device (enumeration failure)". This can happen due to the fact that the operating system cannot find suitable drivers (for example, when updating the OS to Windows 10), or there is a conflict between already installed and new ones. To correct the situation, you must first find the latest version of drivers for the connected device on the Internet, download and try to install.

If you do not know what to look for specifically, then go to the properties of the device, open the "Details" tab and select the "Hardware ID" property from the list.

Identification lines will appear in the field below. We find two identifiers in them - VID and PID. Memorize or write them down. We surf the Internet (for example, on the site pcidatabase.com) and look for detailed information about connected removable disk, phone, mouse, printer, scanner, etc. And then you need to search for and install the current version of the driver.

But if you think that the “USB Device Not Recognized” error is related to a possible conflict between old and new drivers, then to fix it, you will have to completely remove both of them. This is done either again through the Device Manager, or using third-party utilities. After you clean the system from faulty software, you will need to install the latest version and check the operation of the device.

Reason 4. Malfunction of the device itself

Yes, unfortunately this kind of thing happens. This happens especially often with flash drives and external hard drives. Their controller either completely fails, or the area on which the microprogram for the chip is written fails. It cannot boot and therefore the computer does not understand what it is and puts the stigma "Unknown USB device".
Check it out on another computer. If the same error appears there, then carry it to the service or to the trash. For example, my wireless mouse failed in this way. On another PC, it worked without problems. Most likely there was a conflict between her radio module and something else in the room.
Sometimes a malfunction may occur due to insufficient power. This happens with external hard drives. HDDs. In this case, they must be connected not through one, but through two ports at once. For this, a special cable is included in the kit.

Note: If, when turning on various equipment or gadgets via USB, a computer or laptop starts to behave strangely: it turns off, reboots or freezes, then immediately disconnect it and take it to the service. As a rule, this indicates a malfunction of the connected device itself, and further self-diagnosis can lead to even more sad consequences.

Many users, when trying to connect their phone to a computer using a USB cable, are faced with the fact that the computer does not recognize the connected gadget. The connected device is charging, while there is no access to the smartphone itself and its internal contents. I also encountered this synchronization problem, and in this material I will tell you why the computer does not see the phone via USB, and also share various methods for solving this issue.

The whole complex of reasons for the problem that the PC does not see the smartphone through the USB cable, I would divide into hardware and software, and below I will list each of them, in parallel providing instructions for fixing it. But before using the methods I have indicated, try restarting your computer and smartphone - this does not help as rarely as it seems. This problem mainly occurs with devices Samsung, Lenovo, HTC, LG and Fly.

So why does the computer not see the phone via USB, but is charging - hardware reasons

1. Damaged cableUSB. It often happens that the cause of this dysfunction is damage to the USB cable itself. Cables from little-known or "non-name" manufacturers do not have a large margin of safety, and can fail in just a couple of months from the start of operation, and as a result, the computer will not detect the connected phone.

In addition, even the most reliable cables from global brands are prone to stochastic damage - they can be accidentally damaged during use, pets can chew them or spoil them by children. Therefore, first of all, inspect your USB cable for the possibility of mechanical damage, and, if the external safety of the cable, try using it to connect your device to another computer. If the device is not recognized on another PC, try replacing the cord.

2. Damaged portUSBon the computer. The USB ports used in the computer are also prone to various mechanical damage, including damage to the USB controller, as well as south bridge motherboard. Try plugging the cable into a different USB port, if that doesn't fix the connection between your phone and PC, follow the further advice.

3. Damaged socket for connecting the cable on the phone. Has the smartphone jack been exposed to water or damaged? If yes, then it needs to be replaced.

4. Try removing the battery. According to some users who also had a problem with the fact that the computer did not see the phone through U-ES-BI, removing the battery from the smartphone helped.

Turn off the battery, remove the battery from it for a few seconds, then put it back, and turn your device back on.

If nothing helps you fix this problem then describe your situation. What have you already done and what is happening to your Android device when connecting the gadget to a PC via USB in the comments, I will try to help not only me, but also everyone who has encountered this problem.

The computer does not see the phone via USB - software reasons

After describing the hardware reasons, we list the main software reasons if your computer still does not recognize cellular telephone connected with a USB cable, follow the instructions below.

1. Working with the settings.We go into the settings of our device, select "Memory" there, click on the three dots at the top (Properties), select "USB connection to a computer" and put a tick in front of "Media device" (" USB stick"). If you have a checkmark next to using USB as a modem, uncheck it.

Must be enabled on PC windows service Update (for downloading phone drivers) and a new device discovery service. Don't forget to unlock your phone when connected to your computer, this is important.

If you are a conservative and have Windows XP installed, download the Media Transfer Protocol (MTP) for XP from the Microsoft website and install it on your computer.

2. If your drivers have crashedUSB-ports, the computer may not see the phone.When drivers for USB ports malfunction, the latter simply stop working. To fix this problem, install the USB drivers from the "native" driver disk to your PC motherboard, or download the latest drivers from the motherboard manufacturer's website.

Also, due to any reason, power can be turned off for a number of ports.

3. Device drivers have crashed. Go to "Device Manager" and see if there is a question or exclamation point under "Portable Devices".

Check if your device is there and make sure it works fine by right-clicking on it and clicking "Properties". If it's not there, or if you're in doubt, uninstall the driver, disconnect your phone from the computer, and then turn it back on, and let the system install the driver again. This can help solve the problem that the smartphone does not connect via USB to the computer.

It will also not be superfluous to enter the website of the manufacturer of your smartphone and download the latest drivers for it on your PC (for example, there is special software for Samsung Samsung Kies).

4. Install the updateKB3010081 (KB3099229). For owners of Windows 10, you may need to install update KB3010081, which is responsible for working with Windows Media Player. This player is directly related to the normal operation of the MTP (Media Transfer Protocol) service, so download and install these updates.

Also, a common cause may be an unreliable assembly of the OS itself on the PC. Only rearranging Windows with a more working version will help here.

5. Custom firmware is not working. The desire of many fans to play around with firmware for their Android device can do them a disservice in the form of a device failure to work normally with a computer. Try to restore the standard firmware or restore from a backup (if any).

There are no drivers for the phone on the computer

Although, usually, a computer with the latest OS detects and sees a smartphone via USB without problems, reverse cases can also be observed. Try to search for a driver for your smartphone on the net, sometimes a driver for similar models of this brand may come up.

The phone may not be detected by the computer due to viruses

Trite, but all sorts of virus programs can block work with external mobile devices. Try checking your computer with Dr. Web CureIt!, this may help in some cases.

If the problem of detecting a mobile device by a computer is not resolved, reset the settings

If until now, your computer does not see the phone via USB, resetting the smartphone using Hard reset. Go to your phone settings, select the menu item " Backup”, and in it select “Reset data”.

But I immediately warn you that you will lose your files and settings located in the internal memory of the phone (files located on the SD card will remain intact), so this item should be used only as a last resort!

Conclusion

As you can see, problems with the lack of visibility of the connected phone on the PC can be both software and hardware in nature, and there are a considerable number of such problematic factors. I would advise you to first pay attention to the likely mechanical damage in the cable and device, and only then switch to software methods.

In many cases, a simple reboot of the smartphone (temporary removal of the battery) can help, as well as working with the phone's USB connection settings. If all of the above does not help and the computer does not see the phone via USB, but is charging, then you may need to contact a qualified service center.

P.S. For lovers of visual demonstrations, I present a video on the subject:

Sometimes hardware-related Code 45 blue screen errors can be caused by a corruption random access memory(RAM). If you're experiencing random computer restarts, startup beeps, or other computer problems (in addition to BSOD 45 errors), it's highly likely that memory corruption is present. In fact, almost 10% of Windows application crashes are caused by memory corruption.

If you have recently added new memory to your computer, we recommend that you temporarily remove it to make sure it is not causing the Code 45 error. either your equipment or is damaged. In this case, you will need to replace new memory modules.

If you did not add new memory, the next step is to run a diagnostic test on your computer's existing memory. The memory test allows you to scan for severe memory failures and intermittent errors that could be causing your blue screen death 45.

Although latest versions Windows includes a RAM test utility, I highly recommend using Memtest86 instead. Memtest86 is a testing software based on the BIOS, unlike other test programs that run in a Windows environment. The advantage of this approach is that the utility allows you to check ALL RAM for Code 45 errors, while other programs cannot check the areas of memory occupied by the program itself, operating system and other running programs.

Users regularly connect modern Android smartphones to a laptop or PC to reset music, photos or other necessary files. In some situations, the computer does not detect the phone via USB, which makes it very difficult to work with it. There is a certain list of reasons that prevent the device from being recognized.

The computer does not recognize the phone via USB - reasons

All possible variants of problems faced by users can be divided into software or hardware. In the first option, the problem is in the settings, drivers or computer system, in the second - in the cable, USB port of a smartphone or laptop. Almost all problems can be fixed, but before trying to fix the connection of the phone to the computer via USB, try restarting the PC and the device. This simple procedure often helps, especially with models of devices from Lenovo (Lenovo), Samsung (Samsung), HTC, FLY, LG, Nokia (Nokia), Huawei (Huawei), Asus (Asus).

The phone does not connect via USB to the computer, but it charges

A very common problem with devices is when the phone is not displayed in the computer via USB, but the battery charge indicator is on. The smartphone responds to the connection, but the system does not want to display it. To determine the cause of the failure, you can perform the following actions:

1. Move the power cord to a different port on the laptop. Now most models are already equipped with version 3.0 connectors (it is blue), but you need to use 2.0. On stationary versions, the connection should be made from the rear side of the case, and not from the front panel.
2. Try a different cord if the sockets match. This will help you troubleshoot the cable. If one of the cores of the twisted pair is broken, then the smartphone can continue to charge, but not be detected.
3. Inspect the socket of the device, if there is any debris or dirt inside that breaks the connection of the contacts and makes it difficult to find the device.
4. Try connecting the machine to another PC. If it is defined there, folders with documents are visible, and they can be opened, then the problem is definitely in your system: there are no drivers, a virus, the power on the laptop is not configured correctly. This problem will be described in more detail below.

The computer stopped seeing the phone via USB

Often there is a situation when the device was previously detected, but for some reason it suddenly stopped. A common reason why the computer does not see the phone via USB is that port drivers have crashed. Due to software failures, the latter cease to function correctly, are not able to find any connected devices. Reboot device to this case not necessary. You need to do the following:

1. Find the "native" disk for the motherboard. The set must contain all system files for the USB ports to work correctly.
2. If the disk is lost, find the developer's website on the Internet. Manufacturers, as a rule, lay out all the necessary software for free access.
3. Reinstall drivers.

After the PC has finished installing the files, you need to restart the computer. Only at this point is it time to check if the system can recognize the device. If these steps don't work, try additional settings:

1. In the control panel, go to the "Power" section.
2. Select "Setting up a power plan" (for laptops).
3. Click "Edit Extra options…»
4. From the list, select "USB Settings", click the plus sign.
5. Then expand the "Pause USB Port Option" section.
6. Set "Disabled" for battery operation, mains operation.
7. Click "Apply" and "OK".

In addition to problems with port drivers, files for the Android device itself may disappear. To check this, you should open the device manager, find out if there is an exclamation icon in the "Portable devices" section. Check the list for your phone. If it is not there or there is a warning sign, you should do the following:

• open the device and click "Uninstall driver";
• turn off your mobile device;
• reconnect it;
• wait until the system installs the connected device again.

The computer does not find the phone via USB

Sometimes the situation is such that the laptop does not initially find the device. If the reason is not a broken cord or port, then you should carefully check why the computer does not see the phone via USB. The causes of problems can be such moments:

1. Android system settings. Modern mobile devices have several connection options: only charging, storage, modem. By default, most of them are set to the first value in the list. As a result, the device is charging, but not displayed by the system. As a rule, the top menu of the device, when connected, offers to change the type of connection, you just need to select the required parameter. If this does not happen automatically, you need to go along the following path: Settings -> Memory -> Properties. Here you should set the required type of connection.
2. Sometimes a smartphone is used as a modem, which does not recognize it as a drive. Disable this option via settings.
3. Turn on Windows Update, which will allow the PC to download the latest, up-to-date drivers for all connected devices. When connecting, do not forget to unlock your mobile device.
4. When selling together with a smartphone, a disk is provided on which there is a program for connecting the phone to a computer via USB. Use it to discover the device.

The computer does not recognize the phone via USB - viruses

Malicious programs that have entered a PC system can behave in completely different ways. Sometimes they become the reason why the computer still does not see the phone via USB. Viral scripts disrupt work different devices, remove drivers, block data transfer. The risk of infecting a smartphone is extremely low, because viruses for Android are extremely rare. However, to protect yourself from infection, you should check Windows using specialized programs:

• Dr. Web;
• antivirus kaspersky;
• Malwarebyte.

What to do if the phone does not connect to the computer via USB

If your system, after all the above steps, still does not see the device, but you are 100% sure that the problem is not in the USB cable or socket, the device was previously detected, there is only one way out - hard reset. A hard reset will erase all data from the internal memory of the phone and reset it to factory settings. This will eliminate the possibility of a software failure on the part of the mobile phone.

All data that you save on the SD card or cloud services will remain intact. This option should be used in extreme cases - provided that all other methods did not give the desired result, and you are sure that the problem is in the device settings, but not the PC. For each model, be it Samsung or NTS, the manufacturer has programmed hardware buttons that make it possible to perform a hard reset. You can also enable it from the settings if the device turns on and you have access to them.

Video: how to connect your phone to a computer via a USB cable

Doesn't work properly" on its own. They know their computer down to the smallest detail, so there are no questions about how to fix this or that error. But for inexperienced users in this matter, it is much more difficult. For some, even advice from the Internet does not help, because there is too little knowledge and experience.

Problem

But that's not a problem. Any basic PC error can be resolved quickly. To do this, you need to carefully study the instructions and follow step-by-step advice from experts.

Today's problem is when one of them doesn't work properly. Most often, you will notice this text in the lower right corner of the desktop. Sometimes a special window appears with a notification about this problem.

Prerequisites

Most often, the error occurs when connecting any device via USB. This is a regular flash drive, and a phone, and a printer, etc. The problem occurs both at an early Windows versions 7, and on the later - "Ten". However, your USB may be version 2.0 or 2.0. In general, the essence of the issue does not change from this.

Causes

An error accompanied by a USB connection can be caused by a number of reasons. Indeed, there are a lot of them. And they are not always typical. It happens that the fault lies directly and completely with the user, who miraculously removed the drivers or confused the system. There are also flaws on the part of the manufacturers of these devices. Poor quality Chinese flash drives are especially prone to this problem.

Trust but check

So, you saw a similar error on your screen. In order to avoid unnecessary nerves and wasting a lot of time, it is better to immediately check the device that you connect to the port. As mentioned earlier, not all manufacturers are so conscientious. Many people create a product just to sell. This results in system errors.

If you bought a new mouse, keyboard or flash drive, immediately check that it is working properly before sinning on the USB interface. To do this, you can use two methods:

1. If you have a second PC or laptop, just connect your new device to it. If everything is fine on another system, then most likely the problem is in the computer.
2. Take a working device (an old mouse, a second flash drive, etc.) and insert it into the same port. If the same notification appears, then the problem is really in the connector.

There are a couple of hidden ways. They do not always give a clear picture of what is happening, but just in case, you can try them out. So, we take the device that gives an error, disconnect it from the PC and turn off the system along with the plug in the outlet. Now you need to hold down the start button on the computer so that the remnants of electrical charges leave the motherboard.

Now turn on the PC and connect the USB device when the system boots up completely. The option is not the best, but sometimes after it everything really starts to work.

And for those who finally want to make sure that the port is malfunctioning, you can simply turn off all the USB that are on the interface panel. It happens that port overload can give a similar error. If you turn off equipment that is not currently needed, install the USB flash drive in the back panel.

Software methods

Sometimes the problem “One of the connected USB devices is not working properly” cannot be fixed by castling alone. We'll have to dig inside the system. If all the previous methods did not give you a result, let's try to update the "firewood".

To do this, we are looking for "Device Manager". We do through command line: hold down Win + R on the keyboard and enter devmgmt.msc in the field. You can go to "My Computer", right-click anywhere in the window and select "Properties". A window with PC parameters will open in front of us, and in the left column you will find the desired section.

So, in the "Device Manager" select the line " USB controllers”, shows all USB equipment connected to the system. There will be a line "Other devices", it is in it that our unknown device will be located. Click on its name and try "Update Drivers". We are waiting for the system itself to download the necessary files via the Internet, and, perhaps, the flash drive will “come to its senses” and work.

Exclamation point

It may be that next to this "Unknown device" is a yellow exclamation mark. In this case, we try to roll back the drivers. Click on it and go to Properties. Here you need to find a tab with "firewood" and the "Rollback" button. Perhaps it will be unavailable to you, highlighted in gray. Then select "Delete".

Now you need to return to the "Device Manager" window and select the "Action" section from the top, and update the hardware configuration in it. These steps may fix your issue.

The exclamation point may appear for another reason. To do this, you need to go to the properties of the equipment that have acquired names such as Generic USB Hub, USB Root Controller and USB Root Hub. In the window that appears, select "Power Management" and uncheck the first line. This will prevent the equipment from turning off to save electricity.

Common Mistakes and Solutions

As mentioned earlier, the error “One of the connected USB devices is not working properly” is individual and depends on many factors. We have covered the most common causes above. And now let's briefly try to describe what kind of malfunctions other users encountered.

Often this error occurs when connecting a printer. Usually caused by incorrect installation of "firewood". Therefore, you can simply remove them and carefully reinstall them again.

Many problems arise due to mechanical damage. Suppose a cable with a micro-USB connector on one side and USB on the other can be broken or crushed in the middle. It also significantly affects the performance and synchronization of it with the PC.

Another interesting problem, which is now becoming less and less common, can be incompatibility. Some devices do not support 2.0 or newer 3.0. Then it happens that by connecting through USB phone or any other device, you will see this message again. In general, if such a problem has arisen, then it is better to think about changing the motherboard, since the interface standard will continue to change, and there will be even more problems.

Laptop problems

In this case we run into problems USB connections 3.0. Due to the imperfection of this revision of the interface, users have to get out in different ways. A solution has been found. The laptop needed to adjust the power plan.

To do this, you could go to the standard settings for this parameter or to the proprietary software provided by some laptop manufacturers. In Windows, select the power plan that is currently in use, then go to advanced settings. And already according to the familiar scheme, we prohibit disabling ports to save energy.

findings

If suddenly you cannot connect a phone via USB, an external HDD, flash drive and other devices, you don’t need to get upset right away. First, the breakdown of one port out of ten in the system is a common thing. Trying to just use a different connector is as easy as shelling pears. Secondly, even if you didn’t succeed in terms of software, you can try reinstalling Windows.

Of course, reinstalling the OS is not a panacea for all problems and the process is quite difficult, especially for those who have never encountered it. However, even he can help you.

It is possible that your micro-USB connector is not working due to a real controller failure. It cannot be replaced on the motherboard. This is either buying a new motherboard, or, alternatively, purchasing an external controller with a PCI interface.