Laptop heatsink fan randomly stop working

The model of my laptop is Toshiba Satellite L645.
I have encountered overheat issues recently and I thought it was the dust that clogged around the fan. I did the clean up and up everything back. I manage to boot up the computer and reach the window dekstop but the fan spin up for one or half seconds then stop.. Somehow, after a while, the fan worked and spin for quite sometimes.. Then again, the fan spin up for one or half seconds then stop and eventually my laptop overheat again.

IS the problem arises from the fan itself, or the thermal sensor problem? Im not sure.. pls help me =(
 
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