motherboard gigabyte GA-G31M-S2L . I haven`t update yet..does that needed? i using integrated sound realtek. in BIOS no option for enable onboard sound only Azalia code: auto/ disble-if disable no speaker sign during opening the windows and said no audio output.
Go to http://www.giga-byte.ca/products/product-page.aspx?pid=2693#dl
and download new drivers and bios.
Azalia should be left auto.