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My PC starts on its own and quickly shuts down

Last month my PC started to not starting when I pressed the power button, and I switched the power supply on and off and the PC started on its own and quickly shutting down before it could even boot the BIOS.
I sent it to the guy who built twice and the problem vanishes for 2-3 days and suddenly my PC turns on on its own and shuts down i can't turn it on again.
I've done a complete test on the power supply, I tried turning on without RAM , off board video card, Processor. Just with the motherboard on and the fans.
But the problem remains.
What is happening?????

Specs:
Nvidia Zogis GTX 770 Superclocked 2GB
Motherboard Gigabyte GA-Z77M-D3H socket 1155
2 Kingston RAM sticks of 8GB each
Intel core I7 3770K
Power Supply Seventeam 750w V-force ST-750Z-AF 80 plus bronze

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Be sure the BIOS is their latest.
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Test with 4 parts

Psu+mobo+cpu/hsf+power switch.
Nothing else connected.

If it still won't power up replace the bios battery.

Turn off the psu and unplug from the wall.

Remove the old battery and press and hold the power button for 1 min.

Fit in a new battery and test.

If it still won't power up your down to 4 parts.

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