Hey, I've been having this problem since I built my computer 6 months ago. Whenever I go to boot up my computer, it will show a black screen with a single white dash at the upper left middle. I can't access the BIOS from this screen and it's stuck there unless I cut power to the computer completely. I would like to be able to reboot my computer without having to get on my hands and knees and pull the plug every time. I have an ASUS ROG Strix x470-F motherboard and I just did a BIOS update to see if it would fix that and it didnt. I'm also running a Ryzen 5 3600x, Corsair Vengeance LPX 3000, RTX2070S on Windows 10