I am about to buy a MacBook off of a different forum, but the description says that the battery no longer takes a charge, but the seller usually just uses it on AC power. I know that this could just be a case of the battery at the end of its life (its a Core Duo BlackBook), but what if the connector has gone bad? Does anyone know how much the Genius Bar will charge me if the connector has gone bad and has to be replaced?? Edit: He says that the cycle count in About This Mac -> Power is 0. Is this definite that the connector is defective?