Hi

My HTPC has been flawless for years with win7 32bit, a 9500gt and an old pioneer surround amp fed via digital out.  I am building a home theater room and so bought a HD6850 to get DTS-HD etc from PowerDVD playing blurays.

I installed the card and it works fine.  I bought my new onkyo sr608 amp tonight and plugged the hdmi cable from the video card into the amp, and the amp into the plasma.  After getting the resolution right in the control center, i tried to get dolby digital working.  Alas PCM only.  Under the sound tab I can see the ati hdmi output, but the 'supported audio formats' section says hdcp is ok but no supported formats for audio.  The kicker is at one stafe this had a decent list of dolby digital etc, but it has gone.  I have done everything i can think of, reinstalled drivers, used older drivers but I cant make anything show up in the tab.

help please.

Ivan