FAN RUNNING VERY LOUD

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?
Please help.
Cheers

It probably means the computer thinks it is overheating. Maybe it is overheating. As Miriam suggests, intense computational activities generate heat. Possibly dust has accumulated on the inside, or where you are positioning the computer is blocking the flow of air. If the software that controls the fan is not working properly the default mode is to run the fan at full speed. Have you run disk utility to verify your drive to check all seems okay?
Alternatively the computer just thinks it is overheating. There are also hardware analysis tools that come on the disc with your Mac.
There's third party utilities that report temperatures, but Apple says you shouldn't reply upon these, and take your computer to a service center.
This isn't one of those liquid cooled CPUs is it? There was a post about one of those overheating recently and the guy found the coolant had leaked and left a puddle under his computer.
Message was edited by: Limnos

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