I had the same problem after I set up my Onkyo 604. All the settings were right and still no sound. I gave up for the night came back the next day after work and there was sound. Two days later no sound again. Played with the settings for a while still no sound. Shut everything off, turn back on sound. You have to turn the receiver on first then the dvd player. Otherwise no sound only picture. Kind of strange or is this normal?