Tried internal test tones this AM as suggested, no sound. Noticed that the amp button was red and didn't change color after turning the receiver on even after the normal delay. Checked trigger cable for secure connection. On one hand it could appear that there is no signal/sound getting to the amp. On the other hand, I remember during some of the tests that the amp light was blue. Also taking the amp out of the equation by connecting the speakers to the receiver did not do anything. I did not check for the test tones with the speakers connected directly to the receiver.