Well first off, it was wired professionally. I'm not sure why the head unit shut off but I just realized, at the same time, my speedometer went to the max and got stuck there. So it's a good possibility that it's a short. I just don't know where to look next to fix the problem. And I'm wandering, if i switch around the speaker wires, will it change the polarity back to normal and play correctly again? And I haven't checked the phase. And it's in a ported box.