Cooling ventilator makes a lot of noise. How can i stop that?

Cooling ventilator of my iMac makes a lot of noise. How can i stop that?

Try resetting the SMC
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
http://support.apple.com/kb/HT3964

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