On my Onkyo 656 reciever, the left front channel is not working. I switched wires for the mains (at the reciever) and it is the reciever, and not the wire or the speaker. This happened a couple months ago, and I took it to an Onkyo certified repair center and, after they had it for a month and a half, I had to contact them to find out that nothing was wrong. When I got it home, it worked just fine. The guy at the shop assured me that they had done nothing to the reciever. So, what I would like to know is this. Is there a reset switch or something of that nature that could be causing this? It was the front left both times. The reciever was working without any problems, then when I turned it on, the left main had nothing. There was no popping or any other strange noises, just horrible silence. Hopefully someone out there was seen this, or has an idea. Thanks.