Corporate, unless your video card is feeding audio through the DVI port, you will not get sound via HDMI.
I am using the exact same cable from my HTPC (vid card is 8600GTS) to a Panasonic TC-P42S1 and it does not automatically feed audio via the HDMI end. I run digital coax to my receiver for audio.
I don't know if there is a way to make the audio feed through with the HDMI, but in my experience that cable will not do it plug and play.
Edit: Great picture quality though. :thumbsup: