Axiom Home Page Forums General Discussion Technical Questions No sound output from PC playing DVDs

I recently purchased a DVI to HDMI cable to connect my Video card (ATI 4870X2) to my Samsung 750 46" TV so that I could play DVDs, AVIs and Blue Rays from my computer hard drive to my tv.

The picture works great, my PC screen is reflected on my TV, just like a REALLY BIG monitor..

But sound is a problem, I have a Asus Xonar D2X sound card and I have connected an Audio cable (RCA Canare cable) from my S/PDIF output RCA jack of my sound card to my Digital DVD (RCA) input of my receiver. NO Sound at all.. when playing DVD movies using Power DVD or Media Player Classic.

So far in my troubleshooting I have done / tested the following:

1. Playing music via Winamp (FLACs).
A. Xonar set for PCM output on S/PDIF
B. RCA cable from S/PDIF outup of Xonar to AUX of receiver
C. Winamp playing FLAC music files

Results is: Music playing both from PC speakers AND Home Theater speaker system.. loud and clear.. works like a charm.. so I know that the S/PDIF output actually works.

2. Playing DVDs via Cyberlink PowerDVD or Media Player Classic.
A. Xonar set for PCM output from S/PDIF
B. RCA cable from S/PDIF outup of Xonar to DVD input of receiver
Results: NO sound from HT system.. just from PC speakers..

Tried every single configuration option in both Xonar control panel and Power DVD etc..

Any ideas ? ?

Thanks !!