I just tried this, it doesn't work. The same thing happened. It shows a backlit black screen after loading the BIOS screen.
I'm using Rufus since you can't only install UEFI windows 10 using Media creation tool.
So this is what I did:
So it boots with the bios logo.
Then it shows a loading screen without the windows logo.
After that it shows the loading circles with the msi bios for a split second. (literally for 1 second, but somehow I managed to get a picture of it)
Right after it shows the backlit blackscreen.
I have been using the modded version of the bios already. I have also tried the 1.7 Official version. Both do not work.
I also have tried using only 1 GPU(not on riser), no cards(using on board Graphics), 1 GPU(on riser) and all GPU(on risers).
This is what I need to do to get it working:
Disable 4g Decoding. PCIe Gen 1.
Install 1 card at a time. Make sure Windows is happy with the card.
On the 5th card, Windows should report Code 12 on 2-3 cards after installing the drivers.
NOW reboot into BIOS, turn on 4G decoding. Make sure fast boot and any other special boot options are disabled.
Windows now boots after a brief black screen.
Now you can go on to install GPU 6+.
If I try it any other way then exactly as I described, the screen just goes black after showing the BIOS splash screen.
For anyone having trouble with black screen issues. This works perfectly with driver 16.9.2. My windows update ran and messed my driver up causing the black screen. I did these exact steps to fix it. Except with 4G turned off I booted with 1 graphics card and ran DDU and then reinstalled 16.9.2