i could only charge my iPod Classic 120 with my mbpro
but not my IPAD USB power supply (familiar 2 inch square , "10w USB Power Adaptor")
i tried resetting the ipod several times but this did not help.
seems its a problem between the classic and the apple charger
check out this thread for a SOLUTION that worked immediately for me
i tried a small 1 inch cube 5w usb charger from apple and my classic began charging IMMEDIATELY
complete with the charging animation display
Hope this works for you, though its obviously an embarassing apple kludge
my ipod classic does not SEEM to charge using my APPLE charger but my SHUFFLE does????
quote from the other discussion
I did in fact have an online chat with an Apple rep.... who advised me that the 12w usb charger is NOT compatible with the ipod Classic but is ok for my ipod Shuffle. I would need the 5w usb charger for my Classic. So i have purchased the 5w charger and indeed it does work fine on the Classic. so i will be returning my 12w charger to the Apple store when next in the locality......
I really think Apple need to make this MUCH clearer on the advertising!!!!!!
12w could be a mistake, my problematic apple charger is clearly labled 10w