Did you make sure you connected the correct audio cables? There are the AC'97 ones and the HD audio ones. Just checking.
ON ANOTHER NOTE!! I got my Antec 900 Case in the other day and decided since I saw all kinds of sweet stuff going down on this site for mods and cable hiding I would do some myself. So far I have painted the inside black and disassembled the case so I can figure out a good way to route the cables.
Does anyone have any suggestions for routing of the IO and power/reset button panel cables? I think I might just tuck them in the corner but I have the resources to make some nice holes or something. And has anyone been having issues with the back panel bulging due to cables being tucked back there? Solutions? Let me know :D