I have a 3rd gen iPod I haven't used in a while that I just sold on eBay. In preparing to ship it to the buyer, I found that I can't get it to charge at all using either of two different original chargers and cables. I have a 3rd party charger (with a retractable cable) that worked fine. After an overnight charge, all seems okay with the iPod. However, still, when I plug in the original cable and charger (AC adapter), there is no indication it is charging (i.e. no charging icon). The cable I am using to connect the charger to the iPod works fine for connecting to my computer via USB for song transfers, so I don't think the cable is the problem. Also, since neither of two chargers work, I'm thinking it's not that... Any ideas?