HTPC HDMI sound issue

[Butters]

I had my HTPC connected via vga and just a 3.5mm audio lead and everything worked well, I could hear audio for every application through the TV. Music, DVD, TV, etc.

However, when I go over to HDMI, I get no sound from DVD only TV through Vista Home Premium.

Any Ideas?

The board is a Gigabyte S775 nForce 630I

 

[Butters]

Cool, although I did the express install when I inserted the CD. Does that not install the HDMI sound drivers?

Someone mentioned that it might be because MC is outputting a DTS signal which the TV can't decode and to alter the settings.