Pc restarted a couple of times

Hello,
I've had a problem for about a couple of minutes and nownow it's gone.

I watching a video and suddenly the pc restarted and booted to motherboard screen and then restarted again, this time it booted to Windows logo.

It did this twice and then I hard shutdown the pc.

The light of the power button indicating that there's power was off.

So I unplugged the 24pin and 8pin power cables (corsair ax850)and connected from another power supply I had (gigabyte 500w) just to see if there's power coming to the board and the light was on.

So I plugged back the corsair cables back and the light was on again. I turned the pc on played a couple of games on it and everything was back to normal.

Could this be a cable issue or motherboard socket issue?

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