I'd agree with Sleeper. I don't know much about cars, but i have hooked up my fair share of systems. Idk how you hooked up you're sound system, but check all your wires and make sure they are secured the way they need to be. I know sometimes when I've Crimped wires together that when i go to put the head unit it or w.e. the wires can get ripped out or loosen up when I'm in the process of putting everything together.