Problem: Windows does not boot after I install the GPU driver.
OS: Windows 10 Pro x64 v1909.
GPU: Sapphire RX 5600 XT, latest BIOS versions from Sapphire.
MDB: MSI B450 Tomahawk MAX, latest BIOS from MSI.
Also have exactly the same problem. Originally I thought my card died but scouring the web, I found there are many with the same issue. My card had been working fine until recently.
I have also tried all of the above and then some. Freezing at windows load screen on booting and black screen during during installation of drivers. As with everyone else here. I have tried DDU, all applicable driver versions, latest bios from sapphire etc.
Has anyone found any solution yet ? I have the exact same issue on my 5600 XT. I started having this same problem 2 weeks ago but i'm not sure if after driver or Windows update. So for a few weeks i managed to get to Windows but only after making about 10 restarts. Yesterday i didn't managed to get in anymore. I then tried to go to safe mode (which works) and like you guys deleted the driver and worked with Windows Display driver. I then tried to install every single old 5600 XT driver but everytime the Windows went black and Windows wouldn't boot anymore. I also reinstalled Windows 10 1909 twice and on the last attempt i didn't even get to first login anymore. Now i have Windows 10 1903 ISO on my work computer and i will try and install it and report back to you guys with results. And if you have any other solution please share
EDIT: Good news guys. After installing Windows 10 1903 from a year old ISO i immediately disabled Windows update service (also from startup) and installed latest drivers (20.4.1). No black screen and Windows is also booting without problem. Now i did change one more thing so i can't say for sure which one helped but i'm guessing the Windows one. Before installing Windows 10 i changed boot from CMS to UEFI in BIOS. I tried changing this when i first had problems but the Windows didn't even boot to loading screen and it only worked when installing fresh installation.
I ended up buying another GPU, the same model as the one that didn't work anymore.
Good part is now everything works fine, bad part, I went trough hell trying to fix the old one.
So my recommendation is: in case you have this issue, send the card back and get a new one.