Warranty work done--replaced the HDMI board. Brought it home, hooked it up. First time on, worked okay. Second time--and every time since--it still needs power off/power on cycling to display video with the Ceton Echo, and it won't display video with the Apple TV. As before, I used various cables, all known to be good. Obviously, the problem was not with the HDMI board, but I remain confused as to how another problem would have affected the HDMI pass-trhough. I assume there's something in the power board that's doing something to the HDMI board. I'll call the warranty service place tomorrow (whoops--holiday--I guess I'll call on Tuesday) and see what they say about it.
I hope the service company can find the problem--I too, thought it was the HDMI board, and I'm not even sure how they would diagnose this is another component is causing the HDMI board to start malfunctioning. Come to think of it, this is the kind of problem that makes a company take back the unit and replace it with a refurbished unit.
I remain an unhappy camper.