I replaced my 160gb hard drive in iPod classic because the original hard drive was defective. Now the iPod continually reboots. It starts up to the Apple logo and within a few seconds shuts down and restarts. Never ending. I was able to get the iPod into disc mode and connected it to my computer. The computer sees the iPod but iTunes does not. I can read the contents of the hard drive through file explorer. What else can I try?