Why does the fan of my Satellite A500-19W acts weird?

I bought this computer one week ago. I have Windows 7 64 bit. When i surf the net or watch a movie or play music the fan starts for 2 minutes, than stops for 2 minutes than starts again. It's a cycle that never ends and the sound of it annoys me, making me think something is wrong. The computer is not hot other than the vent area. It can't be filled with dust since it's brand new. Is this normal? Should I be worried?

Hi,
My satellite A500 also acts like this, even if I surf the Internet, watching movie and CPU shows only 5%. I don't play games at all. It's not because of dust because I clean it regularly, installed all drivers, bios updated. Mostly, I run it in Power Saver mode but still makes noise.
The only way to make it less noisy to run the fan at constant speed like 54%, I just load the CPU with some applications that keeps fan running almost everytime and no annoying noise noticable

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