Pc shutdown and restart while benchmark

[tarun18s]

I built new pc with these specs.

Motherboard : msi b550m vdh pro wifi

Apu: ryzen 5 5600g

Psu : gigabyte p650b 80+ bronze

Ram : 8+8 xpg 3200mhz 

Ssd : samsung evo 850  500gb 

 

 

So these are my components and all of these are brand new so when i assembled it and start then it work properly but when i run benchmark (heaven) then it show black screen with blinking  curser  on left top of the screen and restart. Same thing happens when i m doing heavy load work. So i set cpu at overclock  using amd driver then it throw same issue when i turn on. Pls help me what will i ll do 

 I check another psu and results same 

[brob]

Are you using the stock cpu cooler? Does the fan on the cooler spin? Is the cpu cooler properly installed?