I have a Mac Book that I purchased in 2009 and all of my system updates are good and it keeps shutting off and when in use it keeps asking me if I want to shut it off... Then it keeps turning on and off on its own. What doI need to do?

Please help!  I cannot figure out how to get the computer to stay on!

With the information provided, I can only guess. My guess is hardware problems, either bad motherboard or RAM.
You tried running the Apple Hardware Test from the install DVD for you Mac.
Allan

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