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

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snabibax

When was the last time you had your PC serviced? When dust builds up on components like capacitors, this may cause those component to fail in the long run.Use a can of compressed air to carefully **** around circuit components like capacitors especially those located within the power supply unit.
Please do not touch any internal components unless of course you are wearing an ESD wrist strap.
If this does not help, then you might consider replacing the power supply unit.
At this point the automatic restart issue should be a thing of the past.