I know you're not promoting it or anything, but still to openly advertise 'Hey its ripped' isn't really the best approach know what I mean? Besides I'm not getting on your case, just informing you.
Anywho, I had a couple motherboards who's onboard sound simply refused to work. Newer motherboards are getting better, but for the most part it has been iffy and I've had 2 or 3 where it worked for a while then would stop for no reason or just not work at all.
You could always RMA it, but you should be able to stick in a PCI card, and I'd assume if that card works then your onboard sound just simply doesn't work. Don't forget to disable onboard sound if you put that card in.