Zumbo if his DOLBY 5.1 is working then yanking the analog cords isn't going to help him because the 2400 obviously isn't defaulting to the analog jacks when he's using DD. In my Pioneer's DVD player you have to turn not only 5.1 out, and bitstream, but also you have to tell it that you have a dts capable receiver, otherwise it just defaults to Dolby, EVEN WHEN you select dts on the dvd discs audio choices. So if the player's dts settign is not enabled and you select it as the dts track you will get no output, silence, nada, zip, zero. Dig it? No way for me to be certain that this is what it is, but sure seems that way given the symptoms.