Fan comes on when I turn on the iMac

When I turn on the iMac, a fan comes on. It doesn't turn off. What does this mean

It might mean a lot of things: from a damaged sensor to a SMC problem. First, try resetting the SMC > http://support.apple.com/kb/HT3964 This should solve the problem if it's related to a problem with SMC settings.
If it doesn't work, it's possible that a sensor is damaged. To make sure of it, run Apple Hardware Test > http://support.apple.com/kb/HT1509?viewlocale=en_US&locale=en_US After starting in Apple Hardware Test, choose your language, mark the option to use extended mode (important) and start the test. If you see an error at the end of the test, copy it here

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