Well I tested today with HDMI and it works now. I'm guessing it's the motherboard's Uefi(bios) Displayport implementation/handshake. The HDMI in my monitor only supports up to 120hz instead of 144hz using Displayport. @samesame , try with a HDMI cable and turn off both monitor and pc and turn everything back on and see if you can get csm disabled working.
I found a link from nvidia's forums with a user having similar issue and the user had a Gigabyte AM4 motherboard but I'm not sure if that user was able to fix it.
https://www.nvidia.com/en-us/geforc...annot-boot-in-uefi-mode-w-displayport-output/
I'm not sure how widespread is this issue and if other users have noticed this issue.
@GBT-MatthewH
Hopefully you can help us with this issue?
I am having VERY similar issues. At first I couldn't get the board to boot with HDMI, so I tried DVI. That worked. Then I left the DVI cable plugged into the video card and plugged in the HDMI cable as well and after a few powercycles it booted into HDMI. I did the same thing with DisplayPort and HDMI - left the HDMI cable plugged in with the DisplayPort and eventually it booted with DisplayPort.
I'm still having issues booting after turning off the power supply, or after a long shutdown period. I push the power button, no display, the board doesn't seem to POST. I push the power button again to turn it off. Then push the button again and it boots. My CMOS settings stay, everything seems fine.
UPDATE: Just tested with both CSM turned on and CSM turned off. No difference for me, I am able to boot either way. Will test cold boot now. Here is my GPU info:
UPDATE2 COLD BOOT: I have no issues with stuff not getting saved in BIOS, and once I've booted once on DisplayPort, I don't have to go through the whole plugging in various video formats thing. BIOS displays using DisplayPort once it's been booted into it once. I'm sure if i have to reset CMOS, I'd have to do the whole chain of DVI->HDMI->DisplayPort again. CSM settings don't seem to matter for me, but I still have to double-boot the computer to get it to boot after Cold Boot. I push power once, fans spins up, lights turn on, then nothing. Push power again, it immediately powers down. Push power a third time, boots into windows (or BIOS, with all settings saved) on DisplayPort with no issues.
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