it might me as simple as the ground cable for the engine. check the owners manual under boost. it should show you how to boost up your engine in case of dead battery. I've got a 03 Accord LX with 86k on I just checked my ground cable yesterday. You woulnd't believe how crappy it looks. If it's not that check with a mechanic, maybe your starter or the alternatior is gone. it could be something simple that you can't see.do you have a remote starter/security alarm? Sometime there are people who like to have a hidden switch installed that disconnects the battery power from the entire vhicle (for theft purposes). I'd look around the dash board, driver's leg room, passenger's legroom, glove compartment or under the hood.GoOd LuCk