Um... My Macbook Pro Sound Is not working....???? I got it about... 3 or 4 months ago. I tried restarting many times... HELP MEH!!!!

Help

The sound went on my MB Pro the other evening, first time that has ever happenned and I've had the machine 4 years. Everything came back fine once I logged out and back in, do you know what happenned to cause the sound loss? My problem came whilst web browsing.

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