i got that motherboard!
must admit one of the biggest mistakes that i have ever made.
Right for a start this motherboard has ONBOARD sound, prehaps this has been disabled in your BIOS. So go into your BIOS and enable this onboard sound. search through your bios to see where this is.
now the website for this company is
http://www.bona.com.tw
click on there. only 2-3 weeks back i was on this site, they have changed it and on a quick glance i could not see any support for our motherboards but maybe u will find it, if not email them, i did so once they r normally good
good luck matey.