The fan of my imac suddenly stays turning and very noisy!

the fan of my imac sudddenly starts to turn, and very loudly. I can't stop it, unless I set off the Mac..What tot do?

http://support.apple.com/kb/HT3964?viewlocale=en_US
These instructions have recenty been modified. They used to read hold the power button in for five seconds after unplugging. I'd try it both ways.

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