-unplug all of the cables and re-plug them in
-restart the computer
-reset the ipod (hold the middle button and play)
-try plugging the ipod in, then opening itunes
try to do a hard reset… which is hold menu and middle button (Or play and middle button I forgot) and wait for it to reboot.
I once blew up my connector because I wired mine into my car wrong… (Positive to negative)