What the...? Fan starts working after 14 months of zilch!

I bought a 24" iMac in August 2009 and noticed that it ran unusually hot. I checked a few forums and was told that this is normal, and the aluminium body acts as a heat sink.
I installed iStat Nano and it showed no fan sensors and temp only for the HD. So I used external fans (3) to cool it down all summer.
Two days ago, I accidentally disconnected the iMac from the power point and quickly plugged it back in -- and fans started blowing!
They're unbelievably noisy and I can't find any way to switch them off or turn them down. @#$%^&* cold, too! (Forget using Skype or microphones... way too noisy.)
No fan sensors showing still on iStat Nano, and temp still only shows HD.
Any suggestions?

Yes do a SMC reset and a PRAM reset, here are the instructions:
_SMC RESET_
• Shut down the computer.
• Unplug the computer's power cord and ALL other peripherals.
• Press and hold the power button for 5 seconds.
• Release the power button.
• Attach the computers power cable.
• Press the power button to turn on the computer.
_PRAM RESET_
• Shut down the computer.
• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
• Hold the keys down until the computer restarts and you hear the startup sound for the second time.
• Release the keys.
Roger

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"I work for HP."
****Click the (purple thumbs up icon in the lower right corner of a post) to say thanks****
****Please mark Accept As Solution if it solves your problem****
Regards
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What the...? Fan starts working after 14 months of zilch!

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