This problem happened to me, where my computer would just shut off automatically everytime after I rebooted or turned it on. The strange thing is that the computer sometimes would stay on a little longer, other times it would just shut off before it even completely rebooted. This situation is most likely a power source problem, and the computer power box could be going bad. On my computer it was a bad power supply and I had to replace it. The power supply box is the big square box right in the corner of your computer where the power supply plugs into. You will see alot of wires and connections coming out of it, as almost everything plugs into this. Power supply boxes don't cost much, you can pick them up anywhere, just make sure if you are changing it yourself that you make note of all the connection wires, because otherwise it will be confusing to reconnect when you get the new one. A computer store can put this in for you very quicky, its just a couple of screws and connect all the wires. If your computer is shutting down automatically after rebooting, most likely your have a bad power supply box.

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