Toshiba Satellite M30 Sound doesn't work

Hi, my dads laptop that he has suddenly has no sound. He traveled home from Canada yesterday, and said before he left it worked just fine, but now at home it doesn't work. I tried just about everything checked in device manager to see if it was working properly and it is. I disabled it, then enabled it and that did nothing. I tried the system restore and that didn't do anything either. I'm out of ideas, any suggestions?