Fan is constantly runnin even if no programs are running

I've had my i mac for roughly 3 and a half years now. Im having a problem with the fan running full blast. even when there are no programs running. I've tried to reset the fan but it still happens. could it be that I just need more memory?

The general 961, we need more details about your system.
It would help us to know what computer model you have, which OS version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by going to 'My Settings' preferences which is located in the column on the right under your name, and filling in the information asked for.
This will help in providing you with the proper and/or correct troubleshooting solutions. The more info about your computer(s) you include, the easier it is to help you.
Thanking you for your anticipated cooperation.
PS: If you do not know the model of your iMac, you can check under Apple Menu>About This Mac which is located in the upper left hand corner of your computer screen or you can check Knowlege Base Article http://docs.info.apple.com/article.html?artnum=301724#301724 How to identify your iMac

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