Question Computer black screening with heavy use

[seniorfiance]

I am at my wit's end here.

My PC:
CPU: AMD Ryzen 5 5600x 6-Core
GPU: RTX 3060
MOBO: Gigabyte B450 Aorus M

A few weeks ago, my computer started to black screen sporadically when I had been gaming for a longer period of time (~few hours). It would eventually restart itself after staying black for awhile, sometimes taking 10+ minutes. I did some Googling and many pointed towards the power supply being the issue, so I bought a brand new one, tested it with a PSU tester, everything was good. Well a day after I installed it, the same issues came back.

Now feeling pretty lost and frustrated, I took my computer to a local repair shop who had it for the weekend. They could not determine the cause of the problem, and it was hard to troubleshoot because it would crash so randomly, sometimes running games without problem for hours before anything would happen. The GPU and CPU were benchmarking beautifully without any hiccups and they reinstalled a lot of core drivers that could have been corrupted if it was the PSU.

I got my computer back on Tuesday, gaming pretty heavily to stress test it and see if the issue was fixed. It worked like a charm. Tonight (8/21), I was playing some more for a number of hours, enjoying the end of a school semester. Well, my PC black screened and restarted once again.

I am wondering if it could still be the CPU even though it is benchmarking no problem, I just don't want to keep buying new parts to then have it not work and wanted some guidance from the experts here.

Side note: I've been monitoring temperatures of the CPU and GPU, everything has looked great. CPU does get higher than 63 C and the GPU no higher than 75 C.

 

[helpstar]

BIOS up to date?

Reset the BIOS by jumper clrCMOS or JBAT or similar (eventually you will have to set the boot priority correctly after that)

check windows integrity
open the command prompt as administrator and type DISM /Online /Cleanup-Image /RestoreHealth
https://www.lifewire.com/how-to-open-an-elevated-command-prompt-2618088
https://answers.microsoft.com/en-us...em-files/bc609315-da1f-4775-812c-695b60477a93


clean boot
https://support.microsoft.com/en-us/help/929135/how-to-perform-a-clean-boot-in-windows


check the memory by running memtest.org usb autoinstaller (bootable USB flash drive)

run the RAM @2133MHz to check if it happens then too
which RAM is it? is it a bundled kit?

check the hard drive for errors with its manufacturer´s tool and if available, update the firmware

use ddu uninstaller and reinstall the latest graphics driver

 

[seniorfiance]

BIOS up to date?

Reset the BIOS by jumper clrCMOS or JBAT or similar (eventually you will have to set the boot priority correctly after that)

check windows integrity
open the command prompt as administrator and type DISM /Online /Cleanup-Image /RestoreHealth
https://www.lifewire.com/how-to-open-an-elevated-command-prompt-2618088
https://answers.microsoft.com/en-us...em-files/bc609315-da1f-4775-812c-695b60477a93


clean boot
https://support.microsoft.com/en-us/help/929135/how-to-perform-a-clean-boot-in-windows


check the memory by running memtest.org usb autoinstaller (bootable USB flash drive)

run the RAM @2133MHz to check if it happens then too
which RAM is it? is it a bundled kit?

check the hard drive for errors with its manufacturer´s tool and if available, update the firmware

use ddu uninstaller and reinstall the latest graphics driver

I'll look at updating the BIOS.

I ran the command prompt as administrator to do the DISM cleanup, but I get error 87 saying that it is not available.

The RAM is also brand new, I'm using 2x8GB T Force Vulcan Z DDR4, so I wouldn't think that is where the issue is at.

I'll get back to you once I've tried the other things, thanks for the suggestions. It helps me feel like I can do something before just dumping money into new parts.