"USB Device not Recognized" on Windows

Courtesy :
"http://www.d-a-l.com/help/drivers/55321-usb-device-not-recognized.html"
"http://www.tech-faq.com/usb-device-not-recognized.html"
"http://support.dell.com/support/edocs/systems/dim8250/syssetup.htm"

==============================================================
"USB Device not Recognized" on Windows
To work around the above issues, one of the below solutions could prove helpful:

Unsecure or Loose Connection
Unplug the presently connected USB device (if any). It is quite possible that the connection is not secure and has become loose. Re-plug the USB device tightly and firmly into the USB port. This is one of the most common reasons for an error in detecting a USB device.

Scan for Hardware Changes in Device Manager
Use the Device Manager to scan for new and recently installed hardware. From the Start menu, select the Run option. In the pop up box, type in Devmgmt.msc and then click Ok. From the Action menu, click Scan for hardware changes. This will make Windows scan & recognize any new devices that are installed. Now, close all opened device managers and control panels. Now, follow the above step and see if your computer detects the USB device.

USB Hub Power Management
Disable power management of the USB hub. To disable the power management on the USB hub, follow these steps; Click Start, and then click Run. Type devmgmt.msc in the popup box, and then click Ok. Expand the Universal Serial Bus Controllers' node, and then follow these steps for each USB Root Hub that is listed.
1. Right-click the USB Root Hub and then click Properties.
2. Click the Power Management tab.
3. Click to clear the Allow the computer to turn off this device to save power check box, and then click Ok.

BIOS Setting
Need to look into the setting of BIOS that enables or disables USB emulation, the factory setting on my computer was enabled. Disabled it, Hope that error message will go away and the device started working again.

To enable or disable Hyper-Threading using BIOS:

Step 1: Shut down and restart the computer.

When the logo appears, press immediately to enter the system setup program.
If you wait too long and the Microsoft Windows logo appears, continue to wait until you see the Windows desktop. Then shut down your computer through the Start menu and try again.


Step 2:When the system setup program screen appears, highlight CPU Information and press .

Step 3:When the CPU information screen appears, highlight Hyper-Threading and press the spacebar on the keyboard to select Enable or Disable.

Step 4:Press to save the setting and exit the CPU Information screen.

Step 5:Press to Save and Exit.

Step 6:When you see the message Save changes and exit now, press . Your computer will restart


Sometimes, simply unplugging the USB device and turning off the computer for twenty minutes and then restarting may solve the issue. If none of the above options have solved the problem, check the manufacturer's website for new driver information. It is possible that your drivers need to be updated.

Registry Issue

Step 1: Remove Hidden Devices
1. Open a Command Prompt.
2. Type "set DEVMGR_SHOW_DETAILS=1" (without quotation marks) and press Enter.
3. Type "set DEVMGR_SHOW_NONPRESENT_DEVICES=1" (without quotation marks) and Press Enter.
4. Type "start devmgmt.msc" (without quotation marks) and click press Enter.
5. Click View. Click Show hidden devices.
6. Click "+" to expand devices, Unknown devices and USB devices.
7. Are there any devices and unknown devices (including grayed out devices)? If so, please right click it and click Uninstall them.

Step 2: Remove all oem*.inf files
1. Click start and click run then under the run line type in the command "cmd" (without the quotation marks)

2. In the command line, type in the following (without the quotes) and press enter after each command:

"cd \windows\inf"
"ren infcache.1 *.old"
"ren oem*.inf *.old"
"del C:\windows\setupapi.log"
"exit"

Step 3: Removing registry entries

Instruction : Removing all entries under HKEY_LOCAL_MACHINE/Enum/USB that start with VID using REGEDIT.Removing the VID entries from the registry will cause them to be redetected at restart.

CAUTION: If you have a USB keyboard, mouse, scanners, and other things you know are working, do not remove the VID entry for these devices, otherwise, Windows may not restart correctly.

1. Click Start and click Run. Type regedit and click OK. The Registry Editor window will open.

2. Go to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\U SB.

3. Highlight and delete all the VID_.... entries for usb devices that you cannot identify. Remember not to delete the entries mentioned above.

You may not have permssion to delete keys, do the following.
Permissions may be set allowing the deletion of the VID_ entries by following the steps below:

a) Right-click the key to be deleted, and then click Permissions. The VID_... Permissions window will open.
b) With Everyone highlighted in the Group or User name section, select Full Control in the Permissions section.
c) Click Apply, and then click OK.

5. Restart your compuer.

Step 4: Reconnect the USB device that was not previously working. Windows should automatically rerinstall the drivers.

===============================================================
After going through this article, I applied this on my system. I found that my pen drive is working fine in my laptop. Hope this will help you as well.
===============================================================

************************************************************************************
Read more:

http://www.d-a-l.com/help/drivers/55321-usb-device-not-recognized.html#ixzz0x0neoIpW
http://www.tech-faq.com/usb-device-not-recognized.html



************************************************************************************