My pc turns off and restarts immediately sometimes, like it thinks its off.

dcboy1600

Prominent
Dec 12, 2017
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540
So i have this new pc, i bought all parts new, but not the PSU. In a week my pc has turned off one time while in game (assassins creed 3) and restarted immediately. Same happened today when i turned my pc on and it was just sitting there on desktop and suddenly turned off and on again. Its like the pc thinks its off and turns itself on again. Only black screen comes and then the motherboard etc. text comes there and it goes to the sing in part. My psu is 420W and i have gtx 1050ti and amd athlon X4 880k, 8gb ram, 120gb ssd and 1tb hard drive, my motherboard is Gigabyte GA-F2A88XM-DS2, FM2+, AMD A88X, DDR3, mATX Anyone know what is happening?
 

dcboy1600

Prominent
Dec 12, 2017
41
0
540

C:\Users\Silentium\Desktop\picture 111.PNG

Here. But how do i heck under full load?