Re: PC Shuts off and turning it on.
You could also try a different PSU (if you happened to have a spare), or test it. 2 ways you can test it: a PSU tester (go out and buy one), or with the paperclip method.
Paperclip method: unbend a paperclip, and unplug the main connector from the motherboard. Unplug the PSU from everything (including the wall) except for something like an optical drive. Now, with the unbent paperclip, insert one end into the GREEN pin, and then the other end into one of the BLACK pins (any one of them will work). Now, plug your PSU back in, and see if you can operate the optical drive. This is just a basic test mind you, to test to make sure it doesn't jolt back off as soon as you turn it on.
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