does the iPod/computer react in any way when you connect the iPod with the computer ?
if you are using windows: do you hear a sound when you connect the iPod ?
check the dock connector on the iPod for lint/debris/dirt or bent contacts
here are the things i would try first
make a hard reset: press and hold the home and the sleep button at the same time until the iPod restarts, try to cennect it again - if it is still not recognized, try to set it into dfu mode and restore it
CLICK for a HowTo video on youtube
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