Fan constantly runs when the computer is in use, as soon as I turn it on, the fan starts up, help?

Does anyone know what might cause the fan on my mac to run constantly? As soon as I turn it on and the unit is clearly not warm yet, the fan is going.

If your iMac has an Intel processor, reset 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.
Apple says that should fix a fan that runs regardless of systems load. If that doesn't fix it, please post back.

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