We just installed the HD DVR (DirecTV HD DVR 20-700?) with our new HDTV (Sony KDL-46S2010). The HDMI cable from the DVR is connected directly to the HDMI input on the TV, and everything is fine when watching programs through the TV's speakers. For movies and some other programs, however, we want to be able to watch the HDTV picture using our home theater set-up. We have a Denon AV-2800 receiver and six speakers. So in addition to making the HDMI connection directly from the DVR to the TV, I sent a Toslink cable from the digital audio output on the DVR to one of the optical digital audio inputs on the Denon receiver. When I switch the receiver on and set it to the corresponding setting for that digital audio input, nothing happens -- no sound from the receiver and speakers. Our DVD player works fine through the receiver through a similar set-up (DVD's video out connected to the TV through component cables, and a digital audio out connected to one of the Denon's other digital audio inputs). I also tried to connect the digital audio out from the DVR to one of the other digital audio ins on the Denon receiver that is normally assigned for another a/v source (VDP), but that didn't produce any sound, either. I have switched the TV video sources to all the different inputs (including the alternative S-Video connection I made from the DVD to the TV), but none of them resulted in any sound moving through the Denon receiver and our home theater speaker system. I also can see red light coming out of the Toslink cable when it is connected to the DVD, so I think it's producing a signal. Am I doing something wrong in the way I have tried to connect the DVD to the home theater system? Is it possible that the Denon receiver is "broken" in some way, or is it something with the set-up I'm using? Any help would be greatly appreciated. We purchased all the new equipment with the expectation of watching HDTV movies on our great surround-sound system, but we can only use it with the DVD player for now.