Going out on a limb here, but if you have a Directv receiver attached, hit the red reset button inside the front right flap. The HD receivers got a botched software update this week that requires a hard restart. I have run 6 service calls this week for this particular glitch.
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thanks so much! We have Direct TV and while we had turned the tv off and on and tried all sorts of combinations of input/mute to no avail. Never thought of the satellite interfering. Hurrah it did the trick! Thanks tons!
DishNet boxes have a similiar issue at the moment where the audio out gets switched to RF instead of bitstream.