Answer for:

Computer turning off and on, on its own....

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I'd almost bet money it's the power supply. Don't make it more complicated than it is.

1. Reseat all boards and components, ie memory, cards, power connectors internally.
2. Verify all cables are tight, no breaks, grounded, no frays, kinks
3. Check for leaking capacitors on mainboard. If any replace mobo
4. If new cards have been added make sure power supply is sufficient (+400W min)
5. Replace power supply, my money's here :)