How to solve the unrecognized usb device?

What should I do if the computer prompts for an unrecognized usb device? I believe that many users have encountered this situation. Recently, a user reflects the USB device that the computer connected to the usb device is not recognized. What is going on? How to solve this problem? The following small series introduces you to the solution of the usb device that the computer prompts cannot recognize.

usb does not recognize us mainly the following ideas, firstly if you are new to on a computer, when the usb unrecognized arise, we need to do is clear in the end is usb analysis The problem with the device product is still a problem with the computer or the line and whether there is a drive problem. When the usb device has been used before, it can not be used now, the driver problem can be easily eliminated.

The company recently had a computer with a fault that usb could not recognize. It took less than 2 months to buy a new usb mouse. Yesterday, it suddenly fell into the computer, and the mouse light flashed. The right foot of the computer desktop has a prompt: "Unrecognized usb device", as shown below:

After checking, there is no problem with the usb device interface, and in my computer---attribute--in device management Found that the driver is no problem, so the editor took the usb mouse to another computer, and found that the problem is still, so it can be roughly judged to be the problem of the usb device itself, because the mouse does not use how long, the general possibility of bad Not too big, often carefully observe the mouse line and find that a small part of the middle end of the mouse line is worn, and the copper wire of the wire inside is exposed. After the worn piece is cut off, the problem is solved after reconnecting the line.

In fact, usb device does not recognize the solution is simple, is that in the end is around the usb device or computer problems, we only need to use a process of elimination you can determine the simple, gradually narrow the scope of the problem, the problem Just solved a lot.

The following are some conditions for ensuring that the USB device can work normally: (1) The USB device itself has no problem —— can be tested on other computers to ensure normal operation; (2) USB interface There is no problem —— can be tested on this interface by connecting other USB devices; (3) The driver of the USB device has been installed correctly. If there is a USB device with detailed instructions, be sure to check the corresponding documentation carefully. Follow the instructions to install the appropriate driver; the current operating system is sufficient to identify most of the USB devices, if it is a driver problem, it is recommended that you use the driver wizard to detect and install.

When it is available on other computers, it is not available on your own computer. If the USB is not recognized by the computer problem, then we need to check the computer settings, such as:

1. The front USB cable is connected incorrectly. This type of fault occurs when the USB cable on the motherboard and the front USB interface on the chassis are connected. This is also quite dangerous, because the positive and negative connections may cause the USB device to burn out. So try to use the USB interface behind the chassis, and use less extension cables. It may also be a problem with the fracture. Look at the USB port.

insufficient 2.USB interface voltage. When the mobile hard disk is connected to the front USB port, there is a possibility that the system cannot recognize the device failure. The reason is that the power of the mobile hard disk is relatively large, and the voltage is relatively strict. The front interface may not provide enough voltage. Of course, a poor quality power supply may also cause this problem. The solution is to not connect the mobile hard disk to the front USB port, replace the inferior low-power power supply or use the hard disk box of the external power supply if possible.

3. Motherboard and system compatibility issues. Hehe, the most famous of these faults is the compatibility of NF2 motherboard and USB. If you are experiencing this problem on the motherboard of NF2, you can install the latest nForce2 dedicated USB2.0 driver and patch, the latest motherboard patch and operating system patch, or try to refresh the BIOS of the motherboard. Can solve.

4. System or BIOS issues. When you disable USB in the BIOS or operating system, it will happen that the USB device cannot be recognized in the system. The solution is to turn on the options associated with the USB device. Just press the F2 or DEL button to enter the BIOS and enable the enable usb device.

5. Be careful when inserting and unplugging. Do not pull out when reading or writing. Otherwise, it may burn the chip. In the XP taskbar, there is more USB device icon. When you open the icon, the U disk device will be displayed in the list. Select to disable the device, and then you can pull out the device, which is safer.

System error & ldquo; USB device not recognized & rdquo;

Symptom: When using the U disk computer unexpected power outages, U disk after reboot does not work properly, plug in the The system reports an error “Unrecognized USB device”. Using the other USB interface device that was originally working properly will prompt the same error message. Plug the USB device into the other USB ports on your computer and it will work.

Analysis of faults: From the point of view of the phenomenon, the interface between the USB device and the motherboard is not damaged. It is suspected that the system is set incorrectly due to an unexpected power failure.

Problem Solving: From the "Control Panel" window, go to the Add and Remove Hardware window, remove all USB devices, and reinstall the USB device drivers you need to use. Restart the computer, USB devices such as USB flash drives can be plugged into the original faulty interface to work properly. Unrecognized USB device - Laptop hard drive failure and removable hard drive, plugged into the front USB interface, not recognized.

this case, a large reason is the supply problem. Since the USB hard disk also needs to consume a certain amount of power when it is working, if the power is directly taken through the USB interface, there is a possibility that the power supply is insufficient. Therefore, almost all mobile hard drives come with a separate external power supply or PS2 interface that is powered by the keyboard. In this case, just connect the external power supply in advance or connect the keyboard through the PS2 adapter cable to ensure that the mobile hard disk is provided enough. Try it after the power, then you should be able to use it normally. Need to pay special attention to everyone's attention, it is recommended to ensure that there is enough power before using the mobile hard disk, otherwise it is likely that the hard disk is damaged due to insufficient power supply.

For those who have never used a USB external device, even if the driver is properly installed, the system may not be able to detect the USB hard disk. This is mainly because the default CMOS port of the motherboard is turned off. Without setting it to the on state, Windows naturally cannot detect the removable hard drive. In order to solve this problem, we can reboot, enter the CMOS setup window, and set the “Assign IRQ For USB” option to “Enable” in the “PNP/PCI CONFIGURATION” column, so the system can give the USB port. Assign the available interrupt addresses.

prompt computer usb unrecognized usb device how to do? It is also possible that the USB interface type does not match and the mobile hard disk cannot be used. For example, the USB interface of the computer configuration is 1.1 standard, and the purchased mobile hard disk is a USB 2.0 standard interface, which requires that the connection line connecting the computer and the mobile hard disk must support the USB 2.0 standard. Because the high-speed mobile device is inserted into the low-speed hub, the device may not be installed properly, and some friends use the USB flash drive while using the USB flash drive. For convenience, the USB 1.1 standard cable attached to the USB flash drive is used directly, which leads to the USB 2.0 standard. The mobile hard drive is not recognized correctly. This can be resolved by simply replacing the cable with the USB 2.0 standard.

The above is a solution for usb devices that are not recognized by the computer tips introduced by Xiaobian. If you have encountered such a problem, you can follow the above steps.