Hi, I think my sound is missing its driver, pc tells me 'no sound device installed' yet it was working before and has stopped(built into motherboard), I have checked all the connections and even tried headphones in back of pc, to no avail, not sure if i have made things worse, but have downloaded several 'apparently' correctdrivers..all different, but, as yet not solved the problem, can you help?

Computers & Internet - AMD - M863G (M863G15CV22ARV000) Motherboard