iPod not recognized when connected to Windows laptop over USB
If your Microsoft Windows-compatible laptop or portable computer is configured to conserve power by turning off power on the USB bus, it might not recognize a connected iPod. To resolve this issue, turn USB bus power back on by doing the following:
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On the Start menu, click Control Panel.
Double-click the System icon.
Click the Hardware tab.
Click Device Manager.
Scroll down the list of devices to the Universal Serial Bus controllers
Click the plus (+) icon next to the Universal Serial Bus controllers.
Double-click one of the indented USB Root Hub entries.
Click the Power Management tab.
Deselect the "Allow the computer to turn off this device to save power" option.
Click the OK button at the bottom of the window.
Restart the computer.
If you don't have a PC laptop or the steps above did not help, see this document for more information.
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.