WTF? I'm missing something, or is it plain impossible? Maybe You got broken wall charger? As i understand, USB connection doesn't work, wall charger doesn't work, but when connected to PC start charging? Hilarious, cause to properly charge from PC it must negotiate 500 mA by means of data pins, so they must be OK. Unless You must charge for ~12 hours from empty to full - that would mean it's charging @ 100mA rate and data pins are indeed broken.

That would explain why wall charger doesn't charge at full speed - inability to check if data pins are crossed - but still, it should charge with "normal" speed (500 mA from dumb power source i.e no data pins connected and it's not a PC USB port).