Is no Audio with HDMI Vista Issue or GF 8600 GT Issue

Basic question,

I got a new computer (w/ Vista) and added a video card to it GF 8600 GT. For some reason when I use the DVI to HDMI output to my TV (37" Vizio which I use as my monitor), it doesn't have the sound (I use an output from the earphone jack to the audio input of the TV). I believe my TV is trying to get both the audio and video from HDMI because when I connect the audio directly to my sound system it works.


Now before, I had an older computer using XP and GF 6600, even though I had the DVI to HDMI out to my TV and the audio from my headphone jack on computer (exact same setup as now), it works fine.

So my question is: is it the video card (some how making the TV think both audio and video is coming from the card) or OS(Vista) issue?

 

I know I shouldn't get sound from the DVI device, but I had the headphone out connected to audio in of my HDMI channel. That setup actually worked befer (see first post), I just don't understand why it's not now.