Dell Inspiron 1545, shutting down

I have a Dell Inspiron 1545 laptop and recently it keeps on shutting down without warning, the fan kicks in (quite loudly) and then total loss of power. It comes back on as soon as I press the on button and it doesnt feel too hot. help please?!
 
You should install fresh copy of the operating system and drivers both may be it will solve your problem. And if the same problem persist again then give it to the service center for hardware check up.
 
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