I have a pair of Onkyo receivers that have different 'missing channel' issues. For "Receiver A" -- The behavior is I'll turn on the receiver, and I'll have 4.1 sound instead of 5.1 -- usually the right front channel is totally missing. No matter what I do, the only way to get it back is to power it off and power it back on again, and then it's stable for a really long time, including some future power off/on events. Receiver B - which I "retired" a while ago (sitting on a shelf) - it had similar behavior except if I cranked up the volume really loudly on the missing channel, I'd hear some static and then it would work fine. This got worse over time - though once the initial sound output was working it would always stay working. Is this a sign of caps starting to go bad? maybe discrete logic? For Receiver B I did take it apart once before and didn't see anything immediately obvious to my eyes at the time. FWIW The source is a 5.1 RCA analog output from a Soundblaster device. Thanks! john