Shut Down Prompt keeps popping up?

I'm running a 13" MacBook Pro with Snow Leopard 10.6.8:
Model Name:    MacBook Pro
Model Identifier:    MacBookPro5,5
Processor Name:    Intel Core 2 Duo
Processor Speed:    2.53 GHz
Recently, I keep getting the shut down prompt even without clicking on the shut down option or pressing the power button. There have even been instances whereby when I press the 'Cancel' key, the laptop just hard shuts down after a few seconds. On other occasions, the 'Cancel' key works as it's supposed to. Does anyone know what the problem is?

hmm PRAM reset according th this support artcile?
http://support.apple.com/kb/ht1379
Might be time to backup your data (not TimeMachine) to a regular external drive, c boot off the installer disk that comes with the computer and reinstalling OS X.
Shouldn't touch your files or programs.
If that don't work, c boot off the installer disk again and this time use the Utilities menu > Disk Utility to Erase and format your drive HFS+ Journaled, when done quit and install OS X again.
You'll have to install your programs from fresh sources and files from the backup. (use the same hard drive name and user name as before for iTunes playlists to be correct)
If that doesn't work, then you can take the machine in for service and tell them you did all these things and it still doesn't work.
They will run a diagnostic, you can too from the disks that come with the computer. Apple hardware check.
http://support.apple.com/kb/HT1509
Also I think if you reboot holding D down (like forever) it also runs the hardware check on newer machines.
Sorry if I'm a bit outdated, I was away from these forums for a few years having  a life.

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