Sound not working macbook pro - intermittent

Yesterday, the sound on my computer was not working. Volume was turned all the way up on computer and iTunes. I restarted and the boot up sound was very quiet. Once, I logged in, I turned the sound up and the sound worked fine. Today, the same thing happened - no sound. I haven't tried restarting yet because I now believe it's a more serious problem. Any help?

One more interesting quirk to this problem. I still get the sound indicating I've gotten e-mail or the swoosh sound when sending an email. I also get the sound of IMs coming in through Adium. I tried other videos on the web (other than iTunes) and they also don't have sound.

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