PC HDMI audio issues

Can anybody help me with this?

I recently bought a i7 920 2.67Ghz wt 3 GB of ram, 64 bit operating system wt win Vista Ultimate.
It's a sweet computer but when I connect my HDMI out to the Panasonic Vierra TV, I only get video.
I know the 2 HDMI channels work on the tv. Used DVD , Blueray and all types of receivers on them.
I was hoping to get help for my PC issue so that I can get Audio
:banghead:

Thank you

it all comes down to your audio card and video card. Is there a connection between the audio card to feed the multi-channel audio through the video card and onto the HDMI cable ? Is it a driver/menu setting to redirect the audio to the HDMI output and not the standard optical output for the audio card ?

they are still on lead