i searched a little bit and found something in a youtube comment by tonysimoni:
1) reboot you ipod(hold center and menu button at same time)
2)while rebooting (so when the apple logo is on) put your ipod into diskmode(hold center and play buttons)
3)plug in ipod, wait like a minute, and while STILL pluged in reboot AGAIN/WHILE STILL PLUGED IN
4)it should then reboot/ start up correctly /and then you should have no more probs. Restore Ipod if necessary in ITunes or whatever have ya.
here is the youtube link