My computer is turning on and off again? Help?

edited October 2009 in Hardware
Hey, my laptop (Toshiba Equium L360) was doing fine last night, until the screen went black on its own right in the middle of what I was doing. I was in the process of installing a driver updater thing (Driver Detective).

Then I tried moving the mouse and it did nothing, so I had to shut it off with the power button. When I restarted it, it was the typical "Start windows normally" or "start windows before changes bla bla". Then when I select either of the 4 options, the computer goes to the introductory Windows XP, and then not even that finishes loading, at that point it quickly flashes a blue screen and then shuts off and does it all over again non-stop.

Help, please. I'm in college, and it's midterms and sadly my computer is my life right now. Thanks.
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