I have never heard the fan in my 24" iMac run until.....

I have never heard the fan in my 24" iMac run until the other day after the power was acidentlly unpulled from the UPS.  During the power-up the fan came on and ran at what must have been full speed ahead, a minimum amount of small was blown out.  The high speed continued for a long time, I had no idea as to what was happening.
I preformed a restart and when the  power up was complete all was fine, and I have never heard the fan run again.  This unit gets warm but has no fan has ever run to the best of knowledge.  Now it seems like it should run sometime during hi CPU usage??
Any thoughts.
Thanks  in advance

The fans are software-controlled, so it's likely that the unexpected loss of power scrambled things temporarily. It probably caused the controller to forget its previous fan settings. When this happens, the fans go to max to protect the computer until the controller can regain new settings appropriate to the task.
The fans run all the time. Their default speed is low enough that you must have the computer in a very quiet room to notice them at default speed. When sensors detect that the internal temps have exceeded a theshold level, the controller send a command to have the fans speed up.
On my mid 2010 iMac quad-core i7, web browsing, word processing, running through e-mail--typical office tasks--have never made the fan speed up. Gaming can. So can videos. I was wathing a commercial DVD movie last night and noticed the CPU's fan speed has moved from its default of about 1000 rpm to about 1300 while the moving was running.
I believe what you saw was normal, and a chance to see how smart the system really is to realized it had lost stored fan speed info and moved the fans to a safety setting while software sorted out the effect of the loss of power.

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