My ipod died a few days back. Disconnected it from the car stereo (has a line out connector to charge/control from head unit), turned it off as other wise it seems to just stay on. when i went to connect it again in the evening I got an error message on the head unit and nothing happened. can't get any signs of life when it's connected, not connected or connected to the pc. Anyone know if it could be a dead battery or how i can check? its a first generation video i think so about 5 years old.