HT1338 HOW CAN I SPEED UP MY MAC IT HAS A GRINDING SOUND AND THE COLOUR WHEEL SPIN AND FREEZES

MY IMAC HAS A GRINDING SOUND AND ITS SLOW, THE WHEEL START SPIINING AND IT FREEZES I HAVE TO TURN IT OFF AND ON AGAIN , WHAT IS THE PROBLEM AND HOW CAN I SPEED IT UP AND GET IT TO RUN FASTER?

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)?
Have you received an email from Apple about their Seagate hard drive recall (for certain iMac models)? Check to see if yours is affected here:
http://www.apple.com/support/imac-harddrive/
In any case, a grinding noise is what I had, followed by other very strange behavior and the diagnosis was hard drive failure. So, whether you are covered or not, I would strongly suggest that you backup all your data as quickly as you can and - if you're not covered by warranty or the recall - book an appointment at your nearest Genius Bar for a diagnosis.
Also, please do not use all caps - difficult to read and it's considering shouting on the internet.

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