Windows 7 shows there is sound and drivers installed, but i get no sound from my machine,yesterday i couldn't boot my pc up and the fans were running woth blinking led, yes i have led fans. And last night i wanted to give it a last try before i go buy new psu( thought that was the problem) i heard high frequency sounds and a strange smell from my psu!!! Today i went out and got back seeing my brother turned on my pc like a charm by just pressing a button, everything seems to work except sound. As i said i have drivers installed( i hope matching ones) because it was all fine until yesterday, can you please help me im tired of fixing it all day.maybe it could be a mobo too, never had this problem before.Thanks