Fan won't stop on my iMac

I have a 2011 iMac (21.5") and the fan won't stop running at full blast. I've spoken with Applecare support, and done all the steps... Which were:
1) SMC reset - performed three times
2) PRAM reset
3) Left the computer off overnight
4) Checked activity monitor - Nothing is open, and the actual activity monitor was the process taking up the most CPU, which was only 2%.
5) My hard drive is nowhere NEAR full - I still have 400GB/500GB available.
The computer functions properly, but the fan is just going non-stop. What could the issue be? I will definitely have to bring this in to the genius bar, but this is my father's computer and he isn't available during business hours to take this in. Does anyone know what this could be? Thanks for the help.

Try running the Extended Apple Hardware Test to see if it has a hardware (thermal sensor or SMC) problem. It won't fix the problem, but it may help you understand and guide the service tech to the problem.

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