or is it one that stuck on the support screen and one that has the music greyed out ?
the greyed out music is a itunes setting
it's set to auto update all songs and playlists - change it to manually manage songs and playlists and the music should be accessible
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the "not playing music" thing is mostly "repaired" with resetting the iPod - but as apple suggests -> [http://www.apple.com/support/iPod/five_rs/|You may need to repeat this step]