Hiya, currently trying to work through the problem so may take a minute to reply!
Short conclusion: Was playing Sekiro and my computer has been on for several hours. Sometimes when games or applications load up I'd get screen artifacts but it's not particularly unusual, my GPU has been doing it for a long while (at least a year) now and I have never had problems in games or applications. Only when loading and buffeting and I never managed to fix it. Now this time however, was playing and got into a loading screen and seconds later I got screen tearing and then dead monitor.
Monitors are now permanently black, tried two and same result. Computer appears to boot up fine, but I have got a VGA error LED that remains lit so my fears are a dead card which is a pain.
I've tried:
-Safe boot
-Unplugging all devices which are not necessary, extra drives, monitors, keyboard, mouse etc
-Safe mode on GPU
System below:
OS - Win10
CPU - Ryzen 7 1800X
GPU - R390X
Mobo - Asus ROG Crosshair 7 Hero
PSU - HX750i
Drivers are all up to date including BIOS. This is not a heating issue, CPU is at 35-40 celcius and GPU last I checked was sitting at 70-75ish. Plenty airflow.
Any ideas, tips, tricks please mention them and I'll do what I can.