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.
Just tried it with no luck. It's been on blackscreen for the past 5min.