Noisy fan Mac mini 3.1(2009)

Hi,
I am the user of mac mini 3.1 and I've upgrade the RAM to 4G and now run the Marverick.
I find the fan is noisy even after starting the mac. The fan will become quiet for short time and return back after I run any applications. Those applications can run well and smooth though I need to wait for a while if multiple apps are opened.
What is the possible causes?
I've checked the activity monitor and only about 20-30% use of the CPU and about 2-3 G for the RAM.
Is it because of the dirt that stuck the fan or lack of lubricant or the high temperature?
The noise really affect when I listen to music.
Thanks for any help.
Nelson Fong

Thanks for reply.
I've tried this but problem persisted.
I think this may be due to the hardware that can't support the new OS.
Or some apps that are not supported by the new OS and so increase the burden of the Mini.
Thanks again.
Maybe I should consider to change a new Mac mini. New version of Mac mini seems to be sold very soon. I will wait and see.

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Message was edited by: Macfinger

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