I have a Sanyo projector hooked up to my PS3 via HDMI. My PS3 is hooked up to my Denon AVR790 receiver via optical cable. We have surround speakers and two subwoofers hooked up to the amp. All of these are plugged into a Monster power bar. In the middle of watching a movie, the sound just cut in and out and something flashed on the receiver then the sound was gone completely; not even sound from the radio tuner. Not sure if we had a power surge, but there was thunder and lightning at the time and none of our equipment lost power, just the sound. From my description of our home theater setup, can somebody please tell me what settings my receiver should have in order to use the optical/digital cable for sound. Thanks so much.