Computer display does not recognize USB device

USB devices are becoming more common, and almost all devices have a tendency to USB, such as printers, cameras, MP3, MP4, readers, but many times, we use USB devices that are not so smooth. Often the "Unrecognized USB device" prompt, then why this prompt, how to solve it?

USB does not recognize the main is the following several ideas, first of all, if it is the first time on a computer, when the USB is not recognized, the need to do is to analyze whether the USB device is a problem or a computer or line problems and whether there is a drive problem. When the USB device has been used before, now can not be used, the driver problem can be easily eliminated.

For example, a computer has a USB unrecognized fault, bought a new USB mouse for less than 2 months, suddenly did not respond to the computer, the mouse led a glittering, computer desktop right foot has a hint: "Unrecognized USB device", as shown below:

After checking that the USB device interface is not a problem, in addition to my computer---properties-in the device management found that the driver is not a problem, so the USB mouse to another computer to use, found that the problem is still, it can be roughly judged as the USB device itself, because the mouse is not used for how long, General bad possibility is not big, often carefully observe the mouse line found in the middle end of the mouse line has a very small part is worn, and the inside of the wire is exposed, and then will grind a broken section after the cut, re-connect the line after the problem solved.

In fact, the USB device does not recognize the solution is very simple, is not just around the end is a USB device or a computer has a problem, we only need to use the elimination method can be simple judgment, gradually narrow the scope of the problem, the problem is much better to solve.

Here are some conditions to ensure that the USB device works correctly:

(1) The USB device itself does not have any problems-can be tested on other computers to ensure that the normal operation;

(2) There is no problem with the USB interface-it can be tested on this interface by connecting other USB devices;

(3) USB device driver has been installed correctly, if there is a detailed description of the USB device, be sure to carefully review the corresponding documentation, follow the instructions to install the appropriate driver; The current operating system is sufficient to identify the majority of USB devices, if the driver problem, we recommend that you use the Driver Wizard to detect and install.

When on another computer can be used, on their own computer is not available on the computer if the problem caused by the USB is not recognized, then we need to detect the computer settings, such as:

1, the USB interface voltage is insufficient. When the mobile hard drive is connected to the front USB port, it is possible for the system to fail to recognize the device. The reason is that the large power of the mobile hard disk requires relatively strict voltage, the front interface may not provide enough voltage, of course, poor power supply may also cause this problem. The solution is to move the hard disk not connected to the front USB interface, replace the inferior low-power power supply or try to use the external power of the hard drive box, if there are conditions.

2, motherboard and system compatibility issues. Hehe This kind of fault is most famous is the NF2 motherboard and the USB compatibility question. If you encounter this problem on the motherboard of the NF2, you can install the latest NFORCE2 dedicated USB2.0 drivers and patches, the latest motherboard patches and operating system patches, or not, try to refresh the motherboard BIOS generally can be resolved.

3, System or BIOS issues. USB devices cannot be recognized in the system when you disable USB in the BIOS or operating system. The workaround is to turn on USB device-related options. is the boot press F2 or DEL key, enter the BIOS, the Enable USB device select Enable.

4, USB driver is not installed properly.

This is the most important fault, when plugged into a USB device, the system will usually prompt "discover new hardware", and install the driver, if we think there is any risk or feel trouble click Cancel, will cause the USB drive does not load properly, so that the USB device is not recognized.

Workaround: Right-click "My Computer", find "Device Manager", find the question mark of the USB device, right-click, will say hello to the USB device, reinsert the USB device, or click "Refresh" in the "Device Manager" interface, will reload the USB drive, follow the prompts the system will automatically install the driver.

Tips: If the brand phone, especially Apple, Samsung, Motorola, Nokia and other brands of smartphones usually have their own drivers, under normal circumstances must be installed in a random mobile phone driver to be correctly recognized by the computer, otherwise it will prompt "unrecognized USB device."

5. The operating system used is overly streamlined, the generic USB drive is streamlined, or corrupted by viruses.

Windows XP, Vista, Windows7 comes with a number of drivers that have been approved by Microsoft, can identify many device drivers, and, of course, USB device drivers. A variety of lite Windows systems, drivers are also a streamlined aspect. It is also possible to encounter virus damage at individual times.

Workaround: In this case you can look for official drivers (such as the accompanying CD-ROM), or use the Driver Wizard upgrade driver, if it is early Win98, Win2000 and earlier versions of XP can also try the universal USB Universal drive.

6, the USB device itself hardware failure.

USB device is very convenient, but because it is often hot Plug and unplug the USB device damage, at the same time, more and more strong magnetic devices in life, such as mobile phones, microwave ovens, televisions will also cause USB chips, especially flash memory chip track damage.

Solution: Encounter this situation to distinguish is the computer USB interface problem or USB device problem, it is easy to tell which interface is broken, try different USB devices on the same USB interface can be recognized, if it is USB device problem, if this USB device on other computers normal, If it is not recognized on this machine, it is possible that the USB interface of this machine is faulty.

For USB storage devices such as USB drives, consider using the official mass production tool to initialize once. (Note that Windows is not formatted, although it is much like, but not.) A large storage device, such as a removable hard disk, may consider using a USB connection with a power supply interface to try it once.

If the computer USB interface failure, you can try to unplug other USB devices to obtain enough USB voltage and other methods to try.

7, whether the USB device is disabled in the CMOS.

This situation in the Internet cafes, school room and the company's computer is more common, this is for the safety of the computer to consider disabling the USB interface, for ordinary home computers and portable generally will not be disabled, but as a last attempt, you can go to see.

WORKAROUND: If you can enter the CMOS, in the motherboard settings related items can be found whether the USB device is disable, if, change to enable.

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