Pc shuts down randomly

[Itzbice]

Im upgrading a friends computer and thought it was all going well. He gamed on it all night. The next day the computer started going black screen and shutting down randomly. I reused his old psu and thought it was that so i had him go get another one and he is still having the issue. We even tried using his old gpu which was a gtx 560ti. Does anyone have any idea what the issue is?

 

Cpu: Ryzen 5 1500x no oc

Mobo: Asrock ab350m pro4 

Memory: cheapest 8gb ddr4 he could find

Gpu: shappire r9 270x 4gb dual-x

Psu: evga 450bt 

Os: 64bit free ver. Of windows 10 up to date. 

Storage: 250gb SanDisk ssd and 1tb 7200rpm i think seagate. 

 

[fuzz0r]

I'd try downloading memtest and running that for a few passes.

[Itzbice]

I will try it when i go back to his place, or see if he can do it. Thank you.

[PJemus]

I had a CPU that would freeze and shut down the computer whenever it was at high load for too long. If nothing else works, put the CPU in another computer and run a long benchmark. I RMA'd mine and they replaced it after almost 3 years with no fuss.