Squealing noise on my MBP!

I was surprised to hear a weird squealing noise from my MBP today! I wasnt sure if it was overheating or if the HD was acting up but then suddenly, the noise went away.
Anyone have this scary experience before?

Find your hard drive in this link and listen to the sounds of bad hard drives.
Perhaps a few of you will find you have a bad one.
DALE

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    Thanks for your time.
    Cheers,  
    Click the “Kudos Thumbs Up" at the bottom of this post to say “Thanks” for helping!
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    W a t e r b o y 71
    I work on behalf of HP

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    Quote
    It actually turns out it's the mobo making this stupid squealing noise!!
    The noise happens mostly when the computer isnt doing anything
    The most common cause of that is a PSU with too much noise on the power lines:
    http://translate.google.com/translate?sl=de&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fmsi-forum.de%2Findex.php%3Fpage%3DThread%26threadID%3D100730&act=url
    What PSU are you using exactly?
    >>Posting Guide<<

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    After some research, the sound is quite like the sound "tink" in apple mail prefs.

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