My laptop has recently stopped detecting external storage devices. When plugged-in to the computer, there's a small notification indicating that a device has been connected, but it won't appear under My Computer.
This problem may happen when USB ports has been disabled! to enable just follow these steps, to enable them:
Click Start, and then click Run.
In the Open box, type regedit, then click OK.
Locate, and then click the following registry key: