Crackle noise coming from speakers i think.. HELP

ok today my macbook started making a crackle-ly sound and im guessing itscoming from the speakers... i dont know why it all of a sudden started today... it will go on for a few min then stop ... i dont know whats wrong... i just got this comp 2 months ago and i havent spilled anything on it al all... the only thing i did diff today was carry it to class while it was asleep...
someone help.. anyone have this happen b4

Try using some ear buds or headphones to confirm if it's coming through the audio circuit or not. Also, try logging into another User account and see if it does it there also.
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There is some useful information here that might help:
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Here is a picture of the back I / O ports:
Figure 2: Back I/O panel
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I work on behalf of HP
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Crackle noise coming from speakers i think.. HELP

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