My macbook (2009) keeps making strange noises. What to do?

Yesterday, my macbook started to make strange noises. A little scratchy noise. Like there's somthing wrong with the Fan or something.
I called Apple Support, but they told me i had to reset the SMC and PRAM/NVRAM. I triend, but the noise is still there.
Does anyone know what to do?? Is it bad?
Its a really annoying sound.

It could be the fan.....or the hard drive.....this is a link to a data recovery firm that has posted the various sounds made by failing hard drives.......
datacent.com/hard_drive_sounds.php
......make sure your data is backed now in case the hard drive is failing.....

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