Lenovo ThinkPad X121e User Manual page 170

Solution: Open the Device Manager window. Make sure that the USB device setup is correct, and that
the assignment of computer resource and the installation of the device driver are correct.
For Windows 7:
1. Click Start ➙ Control Panel.
2. Click Hardware and Sound.
3. Click Device Manager. If you are prompted for an administrator password or confirmation, type the
password or provide confirmation.
For Windows XP:
1. Click Start ➙ Control Panel.
2. Click System.
3. Click the Hardware tab, and click the Device Manager button.
Refer to "Diagnosing problems" on page 131 and run a diagnostic test of the USB connector.
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