How to troubleshoot a USB connection failure the computer does not recognize

A lot of friends will be frustrated by the failure of USB connection, let me briefly say:

1. Front USB cable Connection is wrong. This type of failure occurs when the USB cable on the motherboard corresponds to the front USB connector on the chassis, which is also quite dangerous, because the positive and negative connection is likely to cause the USB device to burn. So as far as possible with the chassis behind the USB interface, but also less use extension cord. It may also be a problem with the fracture, change the USB port to see.

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

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

4. System or BIOS problem. USB devices cannot be identified in the system when you disable USB in the BIOS or operating system. The workaround is to turn on the options associated with the USB device. is the boot press F2 or DEL key, into the BIOS, the Enable USB device select Enable.

5. Pull and plug to be careful, read and write must not pull out, or it may burn the chip. XP in the taskbar more than a USB device icon, open the icon will be shown in the list of U disk devices, choose to deactivate the device, and then you unplug the device, this will be more secure.

In fact, to judge the software hardware problem is very simple, in other machines or to change the system (98 to drive OH) try on it. There are some small problems that you might want to format with specialized software. And to remind everyone to choose Fat in Windows format, do not select FAT32

There is a point is: Buy the machine, the motherboard with the CD, which is the motherboard driver, almost all have a "USB driver" Such an option, loaded him on the line. New drive.

In general, the situation of the virus is very slim, there is the USB virus I sent the software can kill!

There is also a circuit board on the lead may be a virtual weld caused by the abnormal resistance to the signal attenuation too much so that the system can not identify, welding him on it.

Have you tried the mouse keyboard with USB interface to use 嚰?

Also, try each USB port, which may be disabled in the BIOS.

If the registry is disabled, you can change this:

To "HKEY_LOCAL_MACHINESYSTEMCURRENTCONTROLSETSERVICESUSBEHCI" double click on the right "Start" button, the editing window of the "Value data" to "2", the cardinality selected as "hexadecimal" on it.

Hint: "Start" This is the USB device work switch, the default setting is "3" means manual, "2" is to indicate automatic, "4" is to indicate deactivation.

Check whether the USB cable and USB slot are plugged in tightly;

Check your computer's Device Manager for the "Universal Serial Bus Controller" entry, whether there is an error occurring, and whether this controller will work correctly. If this is not the case, you will need to restart your computer, enter the CMOS settings, and set the Onchip USB to enable in "Chipset features setup or integrated peripherals", save and restart the computer.

　　5 possible failures of hard drive

In order to easily store large files, many friends have purchased the USB interface of the mobile hard disk, but in the use of the system can not recognize the mobile hard drive. Why is that? Don't worry, let's just let the mobile drive work for me.

First, set the CMOS parameters

For a friend who has never used a USB add-in, it is possible that the system cannot detect a USB hard drive even if the driver is properly installed, mainly because the default CMOS port on the motherboard is turned off, and if it is not set to open, Then Windows naturally cannot detect the removable hard drive. To solve this problem, we can reboot, enter the CMOS Setup window, and in the "Pnp/pci CONFIGURATION" column, "Assign IRQ for USB" is set to "Enable", This allows the system to assign an available interrupt address to the USB port.

Second, the power supply is insufficient

Because the USB hard disk in the work also need to consume a certain amount of electricity, if directly through the USB interface to take electricity, it is likely to appear power supply. As a result, almost all mobile drives come with a separate external power supply or a PS2-turn interface that is powered by a keyboard. At this time as long as the prior connection to the external power supply or through the PS2 to connect with the keyboard, to ensure that the mobile hard disk to provide enough power after the test, then should be normal use of it. It is important to note that it is recommended that you make sure that you have enough power before using a removable hard drive, or you may be damaged by a lack of power.

Third, USB extension cord failure

In addition to the above two reasons, it is possible that the USB interface type does not match the removable hard drive. For example, the computer configured USB interface is 1.1 standard, and the purchase of the mobile hard disk is the USB 2.0 standard interface, which requires connecting the computer and mobile hard drive connector must support the USB 2.0 standard. Because a high-speed mobile device is plugged into a low-speed hub, the device may not be installed properly, and some friends use a USB drive while using a mobile hard disk, which makes it easy to use the 1.1 standard connector that comes with the USB 2.0 standard, which results in the correct identification of the mobile hard drive. This failure can be resolved simply by replacing the connector with the USB 2.0 standard.

Four, the Windows version is too low

For some friends who are still using Windows 95 or Windows 97 systems, even if the computer is equipped with a USB interface, because the operating system before Windows 98 does not support USB peripherals, install the driver anyway, Setting the CMOS parameters does not allow the removable hard drive to work properly. One workaround for this situation is to upgrade the operating system to Windows 98, and the other way is to download the appropriate patch at Microsoft's official site to allow Windows 95/97 to recognize the removable hard drive.

V. Improper setup of the system

For some Windows 98 users, after the driver is installed, you can view the removable hard disk icon from Device Manager, but there is no corresponding letter identifier in the explorer, which is the result of improper system setup. Double-click the move hard drive icon in Device Manager and click on the pop-up window of the "Properties" button, you can see the disconnect, removable, synchronized data transfer and INT 13 unit four options, which "can be deleted" in front of the system default is not ticked, as long as the option to restart the computer, You can see the new mobile hard drive letter in the resource manager.

Word, the mobile hard disk can not identify the reasons for the failure of more, but generally not USB interface or the fault of the mobile hard disk itself, so we need to eliminate the time from the surrounding relevant part of the consideration, I believe you can also smooth use of mobile hard disk.