Start disconnecting peripheral equipment one piece at a time, then turn the system on at low volume in between disconnects, and see if you can find out what piece is causing the problem. Make sure you disconnect all of the cables/wires for each piece of equipment including power/signal/grounds and any other input to the system from that piece. Many times the cable box coax is the problem and no-one disconnects it until last. Alternately, disconnect everything from the AV7005 and leave it connected to the amp. Turn it on to make sure its not the AV7005 and then install one piece at a time, turning the system on to check if that piece works. You have a lot of equipment connected and you probably have something connected to the wrong place