Our iMac (intel) just started to hum loudly.  It is like the fan is stuck on.  Any ideas?

Our iMac (intel) just started to hum very loudly.  It is like there is a cooling fan stuck on inside the computer.  Any ideas what this is?

Diana,
We don't know what machien you have or the version of OS X it is running because you haven't completed your profile. I would start though by doing a SMC reset.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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