Loud noise/crackling sound from speakers

I have a CoreDuo 2ghz MacBook that is about 5 months old. It's already been in the shop to have a faulty heat sensor replaced (it was randomly just shutting down).
I also have to take it in because the case has become really discolored in areas.
But now I have this awful problem whereby the speakers are sending out really loud crackly noise. It just sitts there sending out this awful noise. Even if I turn the sound off, the crackling still comes from the area of the speakers.
Has anyone else had this problem?
Chris

The problems been noted on this forum before - For Example ...but there's been no proposed solution. Perhaps when you bring your top case in for the discoloration issue you can have them check the wiring around the speakers.
Macbook 1.8-)   Mac OS X (10.4.8)   Week 38 base model w/1G Ram

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