when i turn my ipod classic 160gb thin model on, the apple logo pops up then says use itunes to restore and turns itself off after that, when i plug into itunes, itunes says ipod is in recovery mode and needs to be restored, i click restore, it goes through the process then restarts the ipod and again says the ipod needs to be restored, that hard drive sounds fine, the ipod says the battery is ok but im not sure what the problem is, any ideas?