I've just completed my HTPC everything works perfect except for SPDIF to receiver.
mobo: ASUS M3N78-VM
Sound: On board sound is VIA 1701B 8 Channel with SPDIF out
Blu-Ray: ASUS Blu-ray drive
Video: ATI 4350
Windows Vista (all the latest drivers and BIOS updates I could find)
Receiver: Integra DTR-??02 (No HDMI but has optical SPDIF input)
Okay, so I have my HDMI plugged into my TV and my optical-out running to my receiver. On initial build and driver install SPDIF worked perfectly through my receiver, video/audio, had all of it looked and sounded great. The next day the computer had put itself to sleep (as I configured it to do) when I turned on the receiver and woke up the computer I noticed the PCM input light on the receiver was off. I went into vista sound settings to run an audio test on the SPDIF port and got no sound. I went into the VIA audio setup and confirmed the default was set to SPDIF. I went back into windows sound setting and tested the ATI HDMI sound (which runs through the TV) and there was sound. So, I rebooted windows and at start-up the PCM light on the receiver came on and I heard the Windows vista chime, I fired up a song and I got sound from all speakers. When the song was finished I checked some other setting (but changed nothing) then the PCM light suddenly went off on the receiver, I replayed the same song and got NO sound. I checked the cable and there was no light. Again I reboot windows, the PCM light comes on the receiver, I hear the Windows chimes, the PCM light stays on for 30 Seconds or so then shuts off (receiver works in every other capacity) it just no longer detects a PCM from the computer. It seems that upon boot-up of Windows, the OS sends out a PCM which my receiver recognizes but if I don't play any sound emitting file immediately then Windows stops sending the PCM signal to my receiver. Does anyone have any idea what is causing this, has anyone even seen anything like it? I can't find any thread that comes close!