I suddenly have no sound from my MacBook Pro (bought new about six months ago), which is pretty alarming considering how much music I play on it, videos, etc. I double checked that all the levels are up, no mute accidentally hit. Doesn't work for built-in speakers or headphones.

Anyone ever have this happen? Any suggestions on how to fix? Do laptops still have sound cards, and do they occasionally die? Never had this happen before, really a bit debilitating!