Get something real. You either have a short circuit, or the amp is defective. Check for loose bare or pet damaged wires.
I just bought a sharp micro system ML-DV60 just a bit ago. I am now having alot of trouble with the volume. If I turn the volume up too high it will shut down and display "Protect." I believe that its probably something to do with the pre-amp. Any help on what this is and what I can do to fix it would be appreciated.