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Dell Vostro 3750 cpu fan always running on maximum rpm speed!

Hi I recently found my laptop's cpu fan behaving abnormally.

In normal situation, the fan would run at lower rpm speed most of the time (even after opening several programs & web browser tabs) & the noise was negligible.

Lately, the fan consistently runs on full high rpm speed & the noise is very annoying. I have not installed any new programs & my computer activities (see above) remained unchanged but this fan just keep running at full noisy speed.

I have tried to remove the dust using those can air dusters and even tried SpeedFan software to try to control the fan speed but to no avail.

Can anyone teach me how to control the fan speed to run mostly at lower rpm?

Thank you.

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