Dont know too much about systems but a bit. Deck had no pwer so I checked fuse on it. Changed it. Now has power. Amp had no power so I checked fuse. Changed it. Power light is on now. Sub still will not work. Finally realized that a wire came loose (12V) one so i reconnected it. But I still have nothing from my sub. When i touch the outside of the amp, a metal part with the wire that is supposed to connect to the 12V by accident my sub just pumped barley. And now when i loosen or tighten the screws L R that go to the sub it makes funny sounds and pumps slighlty. Did i wreck my sub?
so the amp got touched by the 12v power wire? you may have just fried your amp. you never work on a system with live wires.
