Question Pc will suddenly shut down in windows

[memmeeyee]

After I boot up my pc, I can get into my bios easily, it will read mobo, cpu temps and show all the fans running and storage drives connected, once I hit save and exit I get into windows, where it acts normal but after 30 seconds, the display suddenly goes to black, while the monitors, PSU, GPU, cpu, ram, are still running. What is happening?

 

[popatim]

Possibly the monitor backlight is failing. Shine a flashlight into it when this happens and see if the image is still there.