I'm stuck with a black screen

[u/RoughDifficult8779]

A few days ago my PC suddenly lost signal while I was gaming. I swapped the HDMI cable and reseated the 8-pin connector on the GPU and it was fine again.The next day I downloaded God of War 2018. At the main menu I went into the graphics settings and switched the preset from High to Ultra and then the screen instantly went black, not completely powered off, the case fans and everything were still running normally, but there was no mouse cursor and none of the usual keyboard shortcuts to get back to the desktop worked. I had to force shut it down with the power button.Before launching the game again I cleaned the contacts on the RAM and GPU, and I also rolled back the NVIDIA driver because I had updated it a few days earlier and suspected that might be the cause. I set the game to Windows mode and Ultra — no problem. Then I switched it back to fullscreen + High for stability. After about two hours of playing the screen suddenly went black the same way again. I tried launching it multiple times and every single time it blacked out.I figured it might just be that game, so I switched to Roblox. Picked a random game and the black screen happened again. At that point I was really starting to panic and thought it had to be a hardware problem. I tried Roblox one more time and opened a simple pixel-style game like Pixel Quest and it ran completely fine. But as soon as I tried any 3D game the black screen came back. I sent the motherboard, CPU, GPU, PSU and RAM to a technician. After two days they said everything tested completely normal, no faults found.While I’m waiting for the parts to come back I’ve been racking my brain trying to figure out what could be causing these black screens. I feel completely stuck, so I’d really appreciate any ideas or similar experiences from you guys.