Use the Five Rs to restore the iPod. You will lose the data that is currently on it if you restore but you can always re-sync the data to the iPod.
http://www.apple.com/support/ipod/five_rs/
-=/ Daft Tech /=-
My ipod wont show up in itunes and when I turn it on it says connected but immediatly after it says...
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My ipod wont show up in itunes and when I turn it on it says connected but immediatly after it says ejecting you may now disconnect.