Sharp Aquos LC-42D65U audio

Hi guys, just purchased the a Sharp Aquos 42". OK, So I hooked up my PC to it using DVI to HDMI and the picture works fine. My TV has a setting that states "PC Audio in" on either PC Input 4 or HDMI Input 6 (which is where my DVI to HDMI is).

I was wondering if anybody with a similar model has got their audio to work? Only Input 1 and Input 2 have RCA connections available, so how will it work in conjunction with HDMI Input 6 where my PC is connected to get the picture and sound from my computer?

Thanks in advance!

So Basically I found an ATI HD 2600 card that supposedly merges the audio onto the video card, so the sound comes out from the 4 pin analog of the DVI connector, can anybody confirm this?