0
I light up my computer and two usb ports do not recognize the external hard drives attached. Nothing nada, except the units do show the power is on. I go to device manager and everything shows they are functioning correctly. So I reverted to the Microsoft tip to uninstall the controllers, and restarted my computer and everything was back to normal. Go figure, windows can be temperamental regardless of edition.
http://support.microsoft.com/kb/817900
Method 3: Disable and re-enable the USB controller
Use Device Manager to disable and re-enable all the USB controllers. This lets the controllers recover the USB port from its unresponsive condition. The USB controllers represent the USB ports in Device Manager. If you are not comfortable with advanced troubleshooting, try the steps in the "Workaround" section.
To disable and re-enable the USB controllers, follow these steps:
- Click Start, and then click Run.
Note If you are running Windows Vista, click Start, and then use the Start Search box. - Type devmgmt.msc, and then click OK. Device Manager opens.
- Expand Universal Serial Bus controllers.
Note You might have to scroll down the list to find this item. - Right-click the first USB controller under Universal Serial Bus controllers, and then click Uninstall to remove it.
- Repeat step 4 for each USB controller that is listed under Universal Serial Bus controllers.
- Restart the computer. After the computer starts, Windows will automatically scan for hardware changes and reinstall all the USB controllers that you uninstalled.
- Check the USB device to see whether it is working.
If this method fixed the problem, you are finished. If this method did not fix the problem, go to the "Workaround" section.
