- Sep 12, 2020
I have the exact same issue with you, but I have figured it out. My PC is connected to a Dell SE2717H, 1080p monitor via HDMI (it also has VGA by the way). I was scratching my head with this behaviour until I disconnected the PC from the Dell and connected it to my 4K Sony TV. And guess, the MAG logo appeared while booting and I could get into the BIOS through <DEL> or through the advanced options of Windows 10. Now to the resolution: find another monitor or TV and if it displays the BIOS go to Settings->Advanced->Windows OS Configuration and change it from UEFI to CSM. After that you will be able to get into the BIOS as you should with your existing monitor.Current Build:
CPU: Ryzen 5 3600 @ Stock
CPU Cooler: NZXT 140mm AIO Liquid Cooler
Motherboard: MSI B450i Gaming
GPU: NVIDIA GTX 1060 6GB
RAM: Corsair Vengeance 16GB (8x2) @ 3000MHz
PSU: NZXT 650W SFX-L 80Plus Gold
Here's the scenario, when booting my PC it skips the BIOS screen completely and boots into Windows straight away. During boot if I try to press F11 or Delete it should display the BIOS or the boot menu, instead of doing so it just stays on a black screen and the PC never boots, bare in mind at this time my keyboard is lit up so there is power being provided to my USB ports. I have also tried to boot the BIOS via recovery settings in Windows 10, doing this also leads me to a black screen where it just never boots.
FYI, when my PC was connected to the Sony 4K TV with UEFI enabled, Sony reported the BIOS resolution as 3840 x 2160 (pic2) , whereas when I changed it to CSM it reported as 1080p (pic1)!!! So I think that for some strange reason the Asus VGA is incorrectly sending a very high resolution which my Dell 1080p monitor cannot display or understand. See the third pic: it must be something with the "Video OpROM policy"