Itunes says ipod has 4000 + songs but when i disconnect ipod from itunes it has nothing on it?

Try to resync the device by wiping it from all data, which I guess it already is, then be sure to check each album you want synced and then on the bottom right click Sync. Be sure you are running the latest version of iTunes by checking out a href="http://www.apple.com/iTunes." rel="nofollow"http://www.apple.com/iTunes./a