Question Random Black Screen-s (Ryzen Win 7)

Jul 21, 2019
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I'm having sudden black screens, maybe once or twice a week, they seem to be random, but I've had longer periods(even weeks) without any. What happens is that I lose both video and audio abruptly, much like a power cut. GPU fan is not spinning at this point(idk if this means anything), CPU and case fans however are. If I hit reset, it won't boot, I have to power down, and up again(turning off PSU at the back is not necessary, just power button).
Now, I've also had occasional BSOD-s(blue screen error, not sure if the two issues are related), and since I've read a lot about it, I'm almost certain it's an issue with Ryzen and my OS, because many ppl seem to have this particular BSOD on Ryzen Win7(DRIVER_IRQL_NOT_LESS_OR_EQUAL PCI.SYS code D1).

Anyway, can this type of black screen that I describe above be caused by OS, or do I have faulty hardware?
My problems began after upgrading to Ryzen and replacing just about everything. However, I did not do a clean OS install, just removed a bunch of drivers in Win7, replaced hardware, then booted up fine, and installed new drivers...
I got the new GPU about a month before the Ryzen system, but I don't remember if I had any issues during that month(according to Event Viewer kernel power loss/Bluescreenview, I did not). So I don't think there's anything wrong with the graphics card, but I can't be a 100%.
At this point, I'm guessing(hoping?) that it's caused by the ancient Win7 install, and/or the Ryzen suddenly losing power for some reason? I have played around a lot with BIOS settings(clocks, voltages, turbo boost, C-states, XMP, etc.), but it's hard to say if they make any difference or not, and it's hard to test since like I said I might go days or a week without anything occurring. So changing only a single variable and waiting days and days is not very feasible.

Well, I'm going to do a clean Win10 install and wait, see what happens, but in the meantime, do you think I might have faulty hardware? Any help will be much appreciated.

PS: my temps are fine, and it doesn't seem to be related to system load. I've done some combined CPU+GPU stress tests. Haven't done memtest yet. Also no OC, but turbo boost and C-states enabled as default, RAM is on XMP(I guess that's considered OC) which automatically boosts it above 1.35v and SoC to 1.1v . Oh and I'm using latest BIOS and drivers.

Specs:
Ryzen 5 2600 3.4 Ghz
Gigabyte A320M-S2H V2 (B350 chipset)
G.Skill Aegis 2x8GB 3000Mhz CL16
ASUS RX 570 Expedition OC
Be Quiet! Pure Power 11 400W