This is odd. I've got three somewhat unrelated questions.

Did you have any sound? (And if so, do you have any analog audio cables connected?)

What processing mode was indicated? (Dolby Digital or DTS would be impossible with an analog signal.)

Is it possible that the 7.1 Direct input got selected? (I ask because 7.1 D is linked to DVD because of the shared left and right analog inputs, although I don't know what the front panel does when in that mode - so this could be a useless line of reasoning...)