DVI-HDMI sound problem.

Use the HDMI port coming out of your 7970, DVI does not transfer audio. There is no physical connections for audio on a DVI cable so no there is not an adapter or software to enable it. The 7970 should also have a couple display ports, if your TV does not accept that you can get a display port to HDMI converter.
 


Skip the middle man, just get a miniDisplayport to HDMI adapter or cable. No need to go from mini to full size and then to HDMI.
 



Hard to tell from just a picture, if you already own this then just plug it in and see. I know there is a lot of confusion with active vs passive adapters and I haven't done enough research to explain it. I would do a quick google search to find out which one you need.
 
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