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

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Check the ground on the outlet, the ground from the power supply to the motherboard (check from the solder pads on the back of the mobo) and check the power for dips and spikes. Repair as needed. Before you put the machine back in service, remove the cmos battery and short the cmos clear jumpers for a while. Set up the machine's BIOS from scratch. If it persists, call a priest.