I know this thread is old but I'm still having the same problem. The closest technician is 45 minutes away and charges $50 just to look at the receiver. That doesn't include parts and labor. I'm a DIY guy and I'd rather do it myself. I bought the banana plugs but they didnt work. The only thing I can do is plug my front left and right speakers into the "B" section of my receiver. Its really annoying only having stereo, but at least I have sound and at least I figured narrowed it down to the issue being with the reciever and not the speaker. I also noticed that my receiver regularly shuts itself off and then back on on a regular basis. I'm positive this has something to do with the main issue. Any help would be great....