I've got an Onkyo TX NR-609 stereo and overall it's been working fine. That said, as of last week it's stopped - the system shows no speakers connected, no sounds plays through the disconnected ...

I'm trying to get to the bottom of some technical issues I've had with my home theater setup. It's always been fed power through a pretty high-end UPS/line conditioner, so I doubt that's the problem.