Explosive sounds from macbook before internal speakers going out TWICE

Hey guys,
So my internal speakers stopped working about a week ago, and a few hours before that my laptop started making weird sounds - it sounded like a mini war was going on inside my computer.. explosive sounds (i know it sounds silly but my friend was there and he heard it too). Then a few hours later, my internal speakers stopped working, AND my headphones wouldn't work either. There is no red light flashing in the headphone jack..
But a few hours later after restarting and shutting off my computer a few times, the sound came back again! The explosive sounds stopped happening.. until a few days later when i heard the sounds AGAIN. And of course, my internal speakers are dead once again.
Everything else on my laptop is fine. Nothing is corrupted, my applications are running smoothly. I'm guessing because the sound is out, videos are not playing either. It would load, but it won't play. Same with iTunes. Even if I select a song, it won't play!
I also ran the hardware test on my laptop twice. Once it's the short version, the second time was the extended version. Both times the results were normal, that there's nothing wrong with my hardware.
Someone please help me! What else can I try?
-Steph

Weirdness, I opened that, but the main volume slider for that is greyed out no matter what I do. It's all weird:
http://img234.imageshack.us/img234/6693/picture2jb3.png
Anybody have any idea what's up?

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