Macbook pro random shutdown "are you sure you want to shut down?"

Firstly, I'm asking this on behalf of my boyfriend who would ask himself if his computer were working!
His MacBook Pro 2.2GHZ new since July07 has just now, when started up, started displaying the shutdown message "are you sure you want to shut down?" and then shutting down anyway. Without being asked or prompted.
This has happened everytime it has been switched on after a couple of minutes it will just do it over again. It is fully charged.
Absolutely no idea what to do other than to take it down to the Mac Store and get it looked at.
If anyone has any help or advice it would be greatly appreciated,
thanks in advance. Charlie

Ok thought i had this fixed myself, i put it down to over heating as it was just acting normally for the last couple of hours but having just turned it off and started shutting everything down for the night it turned itself on!
I think i solved this by shutting the laptop but this has never happened before. I really hope someone can help, I've googled the problem to no avail and this is pretty much my last hope.
Thanks again
Charlie

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Message was edited by: NintendoMad8

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Macbook pro random shutdown "are you sure you want to shut down?"

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