Upgraded partially to a new PC build in hopes of getting a Nvidia RTX 3080 which.. I am still waiting as you might have guessed if you have even remotely followed the release of it.
When I had everything in place the Windows install process was delayed by at least 30 minutes while I tried to figure out why the motherboard LED reported an issue with VGA, meaning my graphics card of Gigabyte GeForce GTX 1070 WINDFORCE OC 8GB.
Because of that I wasn’t unable to enter BIOS / UEFI to add Windows install media USB stick to boot menu. And trying to just boot to USB automatically without setting a boot option didn’t work either. Both of those just caused GPU hang and a black screen, with VGA faulty light on the motherboard.
I attempted to fix it by plugging in HDMI and DVI cables to use another monitor but I never actually unplugged Displayport cable. Which turns out was the cause after all and waste of time.
After unplugging my graphics card and re-seating it back to the motherboard I managed to go to get to Windows install screen but without access to BIOS / UEFI even after the install was done. All attempts to access that just caused a black screen, and then Windows logon screen.
I tried searching for information about that issue and only managed to find this, https://www.igorslab.de/en/drama-baby-asus-tuf-gaming-x570-plus-bios-nightmare-and-uefi-vs-geforce-trx-2060-super-10/. And that didn’t provide any additional information to me but shows the issue I was having quite clearly.
So I ended up asking Asus support about that via email. But before I received a reply I found the solution to the issue from here https://rog.asus.com/forum/showthread.php?119042-First-Boot-Black-Screen-Issues-READ-THIS!. Which indicates that the issue is only for Nvidia GeForce 700, 900, 10 and apparently 20 series of which 20 series isn’t listed on the firmware upgrade page, at least yet. Cannot confirm or deny if the issue is present on 30 series cards because haven’t been able to purchase one as of writing this. And the issue is that the newer Displayport 1.3 and 1.4 wont work out of the box with this particular motherboard.
After performing the fix listed in the Asus forum the issue was fully resolved and I could enter BIOS / UEFI.
And the issue itself makes me wonder why is that firmware update so well hidden by Nvidia and not included in other update packages. For example I update graphics drivers very often and just a month prior to ordering new parts for this build I had updated the firmware with an update package from Gigabyte whos graphics card I am using currently.