1st Gen iPad, 32GB. It will NOT charge using a wall unit. Have tried 2 official Apple branded ones, and one 3rd party. HOWEVER....and this is the rub...it WILL charge (albeit slowly) using the USB port on my Macbook Pro. Put it on the MBP last night before going to bed...this morning, it was slightly improved (up from 20% to 34% charge). Have used compressed air, small brush on the 30-pin dock, no change. Am at a total loss...usually this works the other way around. Any thoughts? Google search has been miserable so far.