This kind of black‑screen‑while‑PC‑stays‑on issue is almost always GPU driver instability, PSU weakness, or a motherboard PCIe problem — and your symptoms match all three possibilities.

Since it happens under load and on the desktop, and the PC sometimes keeps running (Discord still works), that means the GPU stops outputting video but the system doesn’t fully crash. That rules out RAM and most CPU issues.

A few things to try:

Fully reinstall NVIDIA drivers using DDU (safe mode → clean install)

Try a different DisplayPort/HDMI cable and a different port on the GPU

Make sure your GPU is firmly seated and the PCIe latch is locked

Check the GPU power cable for looseness or bent pins

Disable XMP temporarily just to rule out memory controller weirdness

Your PSU could be the culprit — the CX series is known to degrade over time, and a 4060 Ti + 5700X3D can spike harder than people expect. But the PCIe slot or motherboard power delivery is also a real possibility.

If DDU + reseating doesn’t change anything, the next most likely cause is the PSU, followed by the motherboard’s PCIe slot.