Uregent help needed

Urgent help is required

i have a hitachi tv i plugged my pc in using hdmi but i dont get ayn sound

how can this be?
not too technical minded when it comes to pcs so keep it simplier pleasee

You may need to set the output sound as digital in the sound control.

Oh look, try this page
How do I setup my NVIDIA based graphics card to work with my HDTV?

It may be the ticket... I googled "HDMI Sound nvidia 7650gs" if you want to see all the good results.

And incase you haven't, I'd also get the newest driver..