Macbook Pro V10.6.6 making weird sound

My Macbook pro has started making this weird sound suddenly starting this morning. It's coming from the right side and the sound is very hard to explain. It's somewhat krrrrrrr, something like an electric, static sound. It's hard to hear at times but it can get quite annoying when it gets loud. It comes and goes. I tried restarting my computer but the sound still remains. What could that sound be? I hope all my internal hardware is fine
Please help me out here!!

Try doing a SMC reset, it may take a couple of try's. The instructions are:
*SMC RESET*
• Shut down the computer.
• Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
• On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
• Release all the keys and the power button at the same time.
• Press the power button to turn on the computer.
*PRAM RESET*
• Shut down the computer.
• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step
• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
• Hold the keys down until the computer restarts and you hear the startup sound for the second time.
• Release the keys.

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Macbook Pro V10.6.6 making weird sound

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