My system just crashed and I don't know why

May 15, 2018
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Hello guys, about 7 months ago I built myself a brand new pc. My specs are:
Intel I7-8700k , Gigabyte GTX 1060 6GB , 16 GB DDR4 3200MhZ Crosair Vengence ram, 512 GB Samsung SSD 970 EVO MX2 and 1 TB HDD.

Also my processor is cooled by ARCTIC Liquid Freezer 360.

What I was doing when the crash occured is , I was watching a youtube video and I had running 'GTA San Andreas' which I don't think that is the issue as the game just uses about 6-9% of my processor and probably 1-1.5GB ram.
It didn't pop up any error it just turned my monitors black and restarted. What could be the issue?

P.S: I am running Windows 10 Pro and has the latest updates.