If you're using HDMI cables, and assuming that you're using three of them, one for each source and one going to the TV, then I don't know what else the problem could be, unless you have a bad cable (it can happen). With respect to the HD-DVD player, it is possible that there is a "handshake" problem between the HD-A35 and your receiver. Your receiver uses HDMI 1.2 connections, and your HD-A35 uses HDMI 1.3, I believe.
I say that because I had a problem between my 2006 Toshiba HDTV and my 2007/8 HD-A30 Toshiba HD-DVD player, as ridiculous as that sounds. If you see the screen "flashing" between signal and no signal (black screen), then this could be indicative of an HDCP (High-Definition Copy Protection) "handshake" issue. Check and see what happens. One thing that could solve the problem would be a new receiver with the latest HDMI version (e.g., 1.3 or 1.4). My handshake issue stopped as soon as I started running the HDMI connection to my new receiver. Believe me, even the morons at the service centre couldn't figure out what the problem was. I had to figure it out myself.
As you probably don't want to get a whole new receiver, I might recommend that you try hooking up the HD-DVD player to the component inputs. You will still have high-definition playback for HD-DVD's, but you will lose the ability to upscale DVD video. You can then run an optical line for your surround sound. The HTR-6080 doesn't support Dolby True HD or dts-HD Master Audio, so you wouldn't lose much unless you're watching/listening to an HD-DVD that has Dolby True HD, which the HD-A35 would have to process on-board and send through HDMI to your receiver in order for you to hear the "lossless" soundtrack.
I have a HTR 6080 Yamaha receiver, what is the best way to connect my Toshiba HD/DVD A35, Motorola HD DVR set-top box DCT3400 (Shaw provider)and TH-42PZ700U 1080 Panasonic TV via HDMI to this HTR? what else do I need to do beside the cables connections? I'm having problems: my dvd only can heard sound no picture, when my tv is on, sound cut off all the time. The only thing working great is the radio, sound is beautiful without any cut off. What am I doing wrong? I connected DVD and DVR into HDMI 1 and 2 respectively of the HTR. The TV HDMI 1 is connected to HDMI out of HTR. What other kind of configuration do I need to do?
