Original post by: David Iwanicki ,
using a flashlight, inspect the dock connector and headphone jack. There are liquid immersion indicators in both areas, which will turn pink/red if the device has been exposed to excessive moisture. Also look for greenish corrosion on the dock connector pins. If the battery was the only issue, it would at least give you a low battery indication when connect to power. If the immersion indicators are still white, try cleaning the dock connector of debris with a SOFT toothbrush and a little compressed air.