PC is turning off randomly.

realZoso · February 21, 2021

I am experiencing a confusing issue with my PC. My PC will randomly turn off (black screen) and I am having difficulty figuring out what is causing the problem.

A few years ago I purchased a pre-build PC and recently I build my own. The only components that remain from my old pre-built are the CPU and the Motherboard.

Here are my specs.

Asrock z390 phantom gaming 4-ib
i7 9700k
MSI Suprim RTX 3080
OLOy WarHawk RGB 16GB (2 x 8GB)
Samsung SSD 860 EVO
Corsair RM 850x

The shutdowns are seemingly random. Sometimes it happens within minutes of turning on the PC; Other times, 5 hours into a gaming session.

I have ran stress-tests and the PC does just fine. No over-heating or crashing. Today I swapped a Seasonic FOCUS GX-850, 850W 80+ Gold, Full-Modular, for a Corsair RM 850x.

I can verify that the PSU does not seem to be the issue. The PC has turned off since swapping. I have tested, using the 2 sticks of RAM in slots 1 & 3 and 2 & 4. I have also tried using my old RAM sticks. The issue still persists. Currently I am running just one stick of RAM in slot 2. The PC has not crashed since (4-5 hours) and I have also restarted it and it booted, first try. However, this could just be luck. Aforementioned, at times I have used the PC for 8 hours, without it shutting down. I am not sure what the issue is. Is it the Motherboard? I doubt it is the 3080? Is the issue with the RAM slots?

PC building is new to me and I am quite bamboozled to what is causing the shutdowns. Any help would be appreciated.

Bombastinator · February 21, 2021

Shot in the dark. This very well might not be it at all, but what if your PSU is getting its overcurrent protection tripped by spikes from the gpu? Do you have the old gpu still?

realZoso · February 21, 2021

4 minutes ago, Bombastinator said:

Shot in the dark. This very well might not be it at all, but what if your PSU is getting its overcurrent protection tripped by spikes from the gpu? Do you have the old gpu still?

I believe that 850W should be good enough. As, I mentioned it often turns off while Idle.