What does it mean when a loud, whirring noise (fan-like) emits from the iMac?

My iMac (intel...mid 2010) has been working just fine.  Today, suddenly, this loud, whirring noise began.  It sounded like a loud fan but perhaps it's something else? 
I did shut down the computer and waited about five minutes.  When I rebooted it, the sound was gone.
Any thoughts?

You have this information courtesy of the link I gave you.   I cannot account for the noise but iStat Pro seems to indicate what I hoped.   So this is just information.   
CPU fan:  1200 rpm
Hard Drive: 1100 rpm
Optical Drive: 999 rpm
That is exactly the same as my reading now,   I have 10.6.8 on a 2007 iMac 20".

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