Hmm... Did you just build it or did you have it before and now it went out? All I can advise is, make sure you have installed the drivers on your ASUS CD, check audio levels both in Windows audio control and the Soundmax audio control, make sure your speakers are plugged into the green jack, run the audio wizard on the Soundmax control panel. I don't know if it can be disabled in BIOS? Check on that. Good luck.