I installed an aftermarket deck replacing the original 6 disk deck i had which came with the car and mach system, it worked for about 3 minutes and i went inside and came back to it not working... it would not turn on at all i checked connections but nothing... i took out the new deck and wiring harness and put the old deck back and guess what it didn't' turn on either... i checked all connections with the wires coming from in the chassis and they were all connected too. Whats wrong? ideas?