Laptop switches itself off !!!!!!!!!!

  Garden nome 22:09 07 Feb 11

Hi Everybody,
Can anyone please help me ????
A friend has loaned me his "surplus" Laptop (prior to purchasing it) so that I can get familiar with it before making up my mind whether to buy it or not.
I arrived home with it this evening and booted it up and within ten seconds it had shut itself down.This has happened on several occasions. The Laptop is a Lenovo make and the O.S. is Windows XP.
Can anyone give me any advice.
Many thanks .
Garden Nome,

  Fruit Bat /\0/\ 22:15 07 Feb 11

Probably overheating, can you hear any fans start up?

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