I know that many Users have been having issues with their 5600 series GPU card AMD drivers.
I see that your Monitor has VGA, DVI-D, and HDMI inputs and Sapphire has 1 HDMI and 3 DP output ports.
I really don't have any answers as to why you are having that issue except it might be due to the AMD Driver itself. Sometimes using a different GPU Video Output port helps get better results or using a previous AMD Driver like from here: https://www.amd.com/en/support/previous-drivers/graphics/amd-radeon-5600-series/amd-radeon-rx-5600-s...
What does Windows Settings - Display show as your maximum Resolution or "Recommended" Resolution?
You could purchase an Active DP>HDMI adapter for 4k resolutions at 60 hz or higher but they are not cheap or buy a passive DP>HDMI adapter that will give 1920x1200 HD Resolution. They generally cost less than $15.00.
Can you change the Resolution settings to a lower setting to see if you get any video when you have the 'Out of Range' error?
Have you tried connecting a different Monitor or maybe your TV set if it has an HDMI input to see if it works during boot up?
Otherwise I am out of suggestions. Maybe some other Users can give some other tips to resolve your problem.
NOTE: I once had an ACER 1920x 1200 HD Monitor and using HDMI I couldn't see my BIOS but once it boots into Windows I had video. But when I used my DP port I had video during BIOS. My Acer Monitor had both HDMI and DP input ports.
But in your case it is different since you actually are getting an "Out of Range" error whereas my didn't get any errors at all just a black screen until Windows started loading.
