I had my mythbox hooked up to the TV with a DVI-VGA adapter and then had the VGA cable hooked up to the TV..

When I would power on the mythbox I would notice that I would drop channels (using OTA HDTV signal in the USA)

So as a test to solve this issue I had a DVI to HDMI adapter that I used to connect it to the HDTV. Bingo, no more dropped channels as far as reception goes..

LOL Only now there is no sound to the TV.......

Is the HDMI taking over the sound throughput to the TV? I have an NVIDIA based Graphics card installed as well.... Is this an issue other folks have run into? Any work arounds?

Thanks for taking the time to read this and any help at all is appreciated!