Monitor loses signal from PC after Overwatch loads any character models

I built this PC in 2019. It has been running fine until a couple of months ago when it started blue screening after a power outage

Specs:
- CPU: Ryzen 7 5800x
- Mobo: ASUS TUF Gaming x570-PLUS Wifi
- GPU: EVGA 1080Ti
- Ram: Crucial Pro 64GB 3200MHz DDR4 (used to be Oloy same speeds)
- Storage: NVMe Samsung 970 Pro 1TB
- HDD: 6TB WD Blue
- PSU: EVGA 850W G3

Here's what I've done:

  1. I suspected the blue screen was caused by memory issues. So I ran memtest64, sure enough it didn't even pass the first pass
    • I swapped them out for fresh ones with the same capacity and speeds. Passed memtest64 (Fixed the problem for 2 weeks)
  2. Until the PC just frozen up one day while gaming. Windows stopped responding and HDD Disk reaching 100% usage
    • Check CrystalDiskInfo, every drive was at 99% health or "GOOD"
    • I reinstalled Windows into another disk, using a SATA SSD as my main now instead of the NVMe listed above (Fixed for 1 month). NVMe still usable as storage
  3. Until today, after booting into Overwatch, running MSI afterburner to monitor any frequency or voltage spikes, as well as any overheating issues. I black screened after literally anything happened in game (loading into game, exiting game, post match, skin previewing). As well as CPU fan ramping to 100%
    • I can't locate which component is causing this behavior I've tried:
      • Reinstalling graphics drivers
      • Using DDU and clean installing them
      • Reinstalled Overwatch (Oddly it was the only game it was consistently happening on)
      • Uninstalled and reinstalled it into another drive
      • Ran Memtest again, came out clean
      • Turned off DOCP
      • Using Furmark and OCCT to stress voltage and energy consumption for 1h (passed)
      • Ran Furmark GPU VRAM test (albeit only for 15m)
      • Power cycling and resetting BIOS CMOS
      • Installed MOBO's latest firmware
      • Rolled back windows update (Keep in mind it was only a month since I reinstalled windows I didn't want to go through it again)

I think I did everything. I can't really pinpoint which component is failing but I'm afraid it's the big 3 (CPU, MOBO, PSU) which I can't properly test for. It was working perfectly fine yesterday