I think this is key. Did you try another HDMI device (DVD Player, Game Console, etc.)? That will verify if it is you 622 or the TV. Sounds like it might be the folks at Sony that you need to be talking to. I have the Vizio VU42LF and I had an HDMI2 port go bad, but when that happened, it would flash between the input and the "No Signal Found" message.
Unfortunately I don't have another device to try.
So let me get this straight...if it works with 1 device, it should work for all?? It couldn't be a firmware/software issue on the TV? Or could it possibly work for, say, HD DVD, but not for my Dish 622?