iPod won't register on computer or turn on past Apple screen

My Ipod Classic 160 gb is failing all of a sudden. Won't respond at all when not connected to power. When connected, iPod flashes dim Apple screen over and over. If I try restoring it (center button+menu button hold), the screen will light up with the Apple logo but then constantly restarts that. Won't show up on a computer. Can't hear hard drive turning. Is the whole hard drive failing or just the logic board? Also does the fact that it won't respond when not connected to power point to battery issues, or could that also be a logic board issue?