Last night my wife called me into the living room. She had been trying to watch something on the Tivo but at one point the television screen began alternating between black and green. She tried turning off the TV and then turning it back on but each time it powered up it was flashing.
I powered off the Tivo. At first, it seemed to work. The Tivo startup screen displayed. But I guess when it switched over to a different part of the startup sequence the TV went back to alternating between all black and all green.
I tried switching to different inputs on the HDMI switch and even powered off the unit and unplugged it, but still the TV flashed.
Finally, I went for the more elegant trouble-shooting solution and did what I should have tried first.
I unplugged the television from the power outlet.
When I turned the TV back on it was working fine. I’m hoping this was just some odd fluke in the HDMI port and not an early sign of a soon-to-fail TV.