Man, we had some pretty bad lightning and storms last night and this morning my Yamaha TSR-7810 won't turn on. Power light flashes about 20 times when you try to turn it on. Video passes through fine, so electrically those connections are fine. Video interrupts when the receiver is unplugged and comes back on plugged in, with receiver off. Which is fine, and makes sense internally.
My guess is that when we had a series of power interruptions last night back-to-back-to-back the unit went in to a circuit protection mode and protected itself. Unfortunately none of the reset options are helping. Usually "Tone + Info + Power" brings up a diagnostic screen, or "Straight + Power" will bring up the factory reset. In this case "Straight + Power" does nothing while "Tone + Info + Power" does trigger a power cycle, but no menu or other options come up, and the box still won't power on.
Not something I had planned for expenses. Maybe there's a local place that can repair or diagnose.