What is that loud, grinding sound?

Had my computer, MacBook, on all day. Connected to power all day too. Later, about early evening, the house was a little warmer and I tried to put MacBook to sleep when a very loud, almost grinding sound was coming from the laptop. It almost seemed like the sound was coming from the battery compartment but not sure. It was not a drive sound, nor fan sound, or CD drive sound, nothing like that- much louder and nasty sounding. So has this happened to anyone else and does anyone know what this could be? All help appreciated and welcomed. Thanks

This could be the internal Hard Drive being a bit loud when it starts up or it could indicate a potential hard drive error.
If you check the S.M.A.R.T status of your drive in Disk Utility it should give some indication (but not always).
If the system works fine it's probably nothing to worry about, but you should probably speak to Apple Tech Support or make an appointment with an Apple Genius at your local Apple Retail Store just to be on the safe side.
If you have an external drive available to you, make a back up of your system (so you don't loose anything) in case the drive does need replaced.

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http://www.nokia.com/ae-en/support/manufacturers-limited-warranty/

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Have a wonderful day!
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Check your settings in System Preferences>Sound. If that does not help, perform a PRAM reset.
http://support.apple.com/kb/ht1379
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Does the sound appear to be from the hard drive, such as when you do any work (which means the hard drive is being written to)?
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Also, please do not use all caps - difficult to read and it's considering shouting on the internet.

What is that loud, grinding sound?

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