Well after disconnecting everything, it still goes into protected mode. It seems I lucked out that the warranty is 3 years, and I've had it for just a little under 2. Of course that means I need to be without a main receiver in the living room for a number of weeks while dealing with shipping it out, waiting, and having it shipped back. With my having this happen with both a Denon and a Marantz, I'm done with this line - Marantz is certainly not the company they once were. Still not sure where I'm going to next - it's all crap. Perhaps it's time to figure out how to pay for a McIntosh setup, and stop dealing with the cheapo garbage.