Windows 10: Newly built PC crashes to blackscreen then restart while gaming

Hello, I have built a new computer and unfortunately there is a problem,it occurs during gaming only so far and what happens is that the computer crashes,either the game just crashes back to windows OR the screen goes black,fans and rgb continue to run for a while before the whole the computer restarts.Games that I have tested that crash are Red Dead 2 and Doom 2016,Doom Eternal I could play through the whole thing without any problems with everything on Ultra settings,which makes me a little confused..Tried troubleshooting myself but didn't manage to solve the problem, tested older graphics

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Newly build pc keep restarting

I'm having trouble my newly built pc. At first, everything was fine, I was able to play Fortnite for a game. After the game finished, the system started to restart (without any warning or error message). Then it started to does it randomly so I reset everything. Then once got back to windows, and started to install all of the drivers, it just kept on restarting every time I try to install the drivers. The temperature was below 30 C with nothing running and with game, it is below 55 C.

I tried the following suggestions:

1. Safe mode, turn off the automatic restart and update all the drivers
   
2. Auto Repair
   
3. switch the RAM positions/cleaning
   

Here are the parts:
CPU: Intel i7 9700k
GPU: RTX 2070
Motherboard: MSI Z390-A PRO LGA1151
PSU: Corsair CX Series 750 Watt 80 Plus Bronze
Cooler: Cooler Master MasterLiquid ML240L
RAM: G.SKILL 16GB
Storage: SSD 750 GB
System: Window 10 home

If someone is able to help me, I will be forever grateful to you.
Thank you,