My fan is running very loud

My fan is running very loud...Not sure what the problem is..Does anyone have any suggestions?

If it is your fan, the cpu is working very hard.
1. check with Applications/utilities/Activity Monitor, <all processes> , click the %cpu column, what process is running more than 50%?
2. install the widget iStatPro (free), clik the Dashboard: iStatPro will let you see the CPU usage, the temperatures, and the fanspeeds.
If there is a process that is "eating" the cpu, in activity monitor you can quit that process. Check in System Preferences/Accounts   Login Items tab, if it is there, delete it there. Restart the system.

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    Welcome to Apple Support Communities
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    http://bjango.com/mac/istatmenus/
    And/or iStat Pro...
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    anyone?
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    I am wondering if anyone has had or heard of the fan in a 24" iMac suddenly running quite loud? My computer is a year old and today I turned it on and it sounds like a desktop DELL!! The fan is so loud. Is this an ugly monster rearing it's head? or is this a minor issue that might go away?
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    Message was edited by: Limnos

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    Hi..
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    As a rule it is not a good idea to run Terminal commands unless you have a better understanding of what the results should be.

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