If when you connect the ipod- the "Do no disconnect" screen does not come up- then you can try putting the ipod into forced disk mode. This will force the ipod to connect to your pc/mac
1. Before placing the iPod into disk mode, you should verify that it is charged.
2. Toggle the Hold switch on and off. (Set it to Hold, then turn it off again.)
3. Press and hold the Menu and Select buttons for at least 6 seconds until the Apple logo appears.
4. When the Apple logo appears, release the Menu and Select buttons and immediately press and hold the Select and the Play/Pause buttons until the Disk Mode screen appears.
5. Connect the iPod to your computer; the screen on the iPod will change and say "Do not disconnect"
From here I suppose you could always perform a restore.