MacBook speaker noise / hissing

My MacBook (purchased March/April 2007) makes a hissing/popping noise from the speakers (i assume) after being on for about 30 minutes. The volume and mute buttons have no affect on it, it will continue indefinitely. Very annoying and it makes it impossible to concentrate let alone listen to music or watch itunes videos. Here's a link to a YouTube video i made of the noises.
http://www.youtube.com/watch?v=qcK0VJMM5z4
If I need to buy AppleCare to get this fixed, I will.

EDIT:
After starting up on the DVD and still hearing the noise, I decided to instead restart and zap the pram. Give that a try... so far so good.
It's done by holding down Command-option-P-R on restart (right after the first chime & before the screen come on), then releasing after the second chime. Or for even more drastic measures if that doesn't work, look here (if you dare ^_~ ): http://docs.info.apple.com/article.html?artnum=303319
(I'm not familiar with the new Intel Macs & only have PPCs, so if someone else can direct correctly otherwise, please do so ^_^ )
Anyways, good luck!

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