I have a Sony home theater system and it was working perfectly up until yesterday. Tuesday night I was watching TV with full sound coming from the receiver/speakers. I shut everything off as usual and last night I turned it back on and now have no sound despite everything powering on as usual. I tried using the FM tuner built into the receiver to see if it was just a tv issue and have no sound with the tuner either. I can't imagine what would of happened since nothing was moved, no buttons pushed, or wires undone between uses. Anything that I can look into for a possible fix? System was bought new 4 years ago, 1000 watt with a 3d blu ray player as the receiver.