Thanks Davcon for the reply - wish it was that easy. Upon opening up playback devices, all that was listed was ATI HDMI Output and SPDIF Interface. I had to go to the install DVD and install the VIA drivers manually found here: D:\Drivers\Audio\VIA\Win7-64_Win7_Vista64_Vista_XP64_XP(V8100f) and run setup. (D is the drive letter, change accordingly) It was strange because it looked like the install failed but it wanted to reboot anyway, so I did. Next login, poof, I had sound. Opening up playback devices then showed speakers using VIA High Definition Audio as default.
I have the same problem with this motherboard and the sound just stoped working one day. Did you take the dvd that came with the motherboard och did you found drivers online?