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I've encountered probably the most annoying issue possible for someone trying to diagnose it.

Roughly every week, my computer suddenly blackscreens (no signal to monitors) while staying powered and absolutely nothing will work, not even the power or reset buttons. The only way I can turn it off in this state is to flip the PSU power switch.

The reason it's so annoying is because it's not reproducible and yet it's potentially dangerous. I'm at the mercy of having to wait another week for it to happen again.

When the PC is working normally, nothing would suggest there's anything wrong with it. I've stress-tested the CPU and GPU several times, and they both perform very well. I initially thought the issue had been related to a GPU overclock I tried, but I disabled the overclock, and it still occurs. The symptoms also do not resemble those I saw while overclocking the GPU.

Additionally, I also discovered Windows Task Scheduler was running the Windows Experience Index automatically every Sunday at 1:00AM for some reason, which seemed to correlate to the issue time, so I thought that was somehow stressing something badly, however I disabled that and the problem still happened (last time on Monday).

So far it's occurred on roughly:

• Fri 31 August at roughly 7:30PM,

• Sun 2 September at roughly 3:30PM,

• Mon 10 September at roughly 2:00PM and

• sometime between Sun 16 September at 6:00PM and Mon 17 September (today) at 5:00AM (the computer woke up from Sleep into this state, so the problem doesn't even care whether my PC's fully powered).

There's no particular running program or action which seems to determine whether it'll happen, so I'm led to believe it's some hardware issue.

I'm now at a loss. Nothing online seems to have this specific issue I have. What could be causing it, and what should I try next?

Specs:

CPU: AMD Ryzen 7 2700X

Graphics card: EVGA NVIDIA GeForce GTX 1070 Ti SC GAMING

RAM: Corsair Vengeance LPX 32 GB (2 x 16 GB) DDR4 2400MHz C14 (CMK32GX4M2A2400C14)

Motherboard: ASUS Prime X370-PRO

Power supply: EVGA G3 750W

Storage: Kingston A400 240 GB SSD, Seagate Barracuda 2TB 3.5" 7200RPM

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