Unbelievable. I guess I'm an idiot. *SMH* Yes, apparently that's exactly what happened. My wife said the kids were just watching TV and the sound went out. I guess they were holding down the mute button. I've never even used headphone mode before, so it wasn't on my radar. I had to look up how to turn it off. But that did it! THANK YOU! I thought for sure some DAC chip or diode or capacitor had fried. Thanks, butchgo!