Hi, I hooked up my GIGABYTE GA-MA78GM-S2HP to my Sony Xbr HDTV using an HDMI 1.3 cable and the video is fine, but I can't seem to get any audio. This thread suggested that I download the ATI catalyst driver and the Realtek ATI HDMI Audio Device driver, which I did but I still can't get any sound. When I hover over the litte speaker icon on the taskbar it says "no audio device" with a red x. Can someone help me? Thanks.