CONNECTION
Go under the hood, and check to see that all the wires are connected to the Battery.
I remember in my brothers old car, he had the same problem. I looked under the hood and one of the big wires had slipped and wasnt getting any power from the battery.
Another possibility, could be that one of the wires has maybe been chewed through by a mouse, or rat.
Do any of the lights on the console light up?
Look at the main things, and then if you have no luck, bring it in to the dealership, and have them take a look
Good luck!