You know, I have the same damn problems with my MoBo.. an Asus P4S533-X, on a P4 2.4B, with Altec Lansing 200 speakers. I can't hear any damn sound! Of course, it was the same with the Abit SA7, but... I dunno. I know it's not the speakers, because it works find on my Mac, my dad's pc, and my CD-player, so i guess it's some sort of software problem.. but i can't figure it out