Oh, it's a Macbook Pro, Unibody 15".
Hi
I was adjusting the volume of my Macbook pro using the F11 F12 keys, when there was suddenly a loud high pitched 'wooop' noise. I may have touched another ket whilst doing this (I've got clumsy fingers).
Now there is no more sound. I've checked the Sound preferences and all seems normal, but still no sound.
Any ideas?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic