Fan constantly running loud - iStat reporting 0 rpm

Hi guys,
hope somebody can help me, my iMac suddenly started to make a very loud noise, the fans are spinning at high RPM!
I already tried to reset the SMC, unplugged my Mac for a couple of hours, plugged it in while pressing the power button - unfortunately nothing helped. When starting while holding the power button, it gets even noisier, therefore i expect only one of the fans is running at full or near full speed constantly.
I now tried to install some hardware monitors to check on temperature/fan speed. iStat nano is reporting low temperatures, but the strange thing is that it gives 0 rpm for the CPU fan, even though its clearly running at high revs...
I don't have Apple care and my iMac 24" is now roughly two years old. Any help is highly appreciated!
thanks,
A

Try doing a SMC AND PRAM reset by:
1. Turn off your iMac and unplug everything from it for 30 seconds.
2. Plug in the power cord, keyboard and mouse only.
3. Press the power button and immediately hold down the Option, Command, P & R keys until you hear the second gong then release the keys. Your machine will start up normally, then check for the issues you are having.

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According to iStat:
Temps
HD 83*
ST3500 88*
ST3500 88*
CPU A 259*
CPU B 259*
Ambient 70*
HD Bay 72*
HD Bay 70*
Fans
Exhaust 2777 RPM
CPU Fan 2813RPM
Power Supply 599RPM
HD/Expansion 2841RPM
Message was edited by: JTA411

That is what iStat was saying. I could have cooked a pizza if it was truly that hot. Fortunately the SMC just needed a reset. Not sure who writes those fix it help pages but disconnecting everything for 15 seconds didn't work. Perhaps they meant 15 minutes?

Fan constantly running loud - iStat reporting 0 rpm

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