Computer makes clunking sound after installing OS Lion

Ever since I installed OS Lion, my iMac now makes a quiet regular clunking sound all the time in the background, as if it is processing something. ....Never noticed this before. Any ideas what this could be?

Computers don't make clunking sounds when they are processing things. You can't hear the processor. You might conceivably be hearing a malfunctioning fan.
If the sound is audible, take your mac to an Apple store for a hardware test.

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    We're sorry.
    We can't find the article you're looking for.
    Please return to the Apple Support homepage.
    Sigh.

  • After install the lion ، the computer it's became slow

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