no sound on HDMI

[chuckl3s]

hey,i have connected my computer to an HDMI cable and configured the resolution for it but, i can't seem to get sound to play through my tv. i have tried setting the HDMI digital output device to default but it didn't work. what should i try next? i am on vista

 

[Chiisu]

Laptop or Desktop? Brand of Computer or is it custom built? If custom built, what is the mother brand and model number? If you have a graphics card installed and your HDMI is coming from it what is the graphics card?