Why is my laptop sounds like a Boeing 747.....what should do to stop it?

Update: HP dv9000....the fan is so noisy when I turn it on or from time to time.
Update 2: @ Richardo.....I take good care of my laptop, it's always clean. I think it's the fan needs replacing and the hard drive. The laptop is revealing what the problem is noow.....I need to get it fixed :(
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