Can't get the BIOS to show itself!

Hey everyone, so I've been getting a WINDOWS\SYSTEM32\atiadlxx.dll error constantly. So I thought it was probably a driver issue, can't update video drivers because of this issue though. I recently wiped my PC of everything except windows. Thought maybe it could have effected something in the BIOS?

After finding out that my Corsair keyboard needed a BIOS compatibility button, and that it was F12 and not DEL to get in, i can't get the screen to display anything. I've been in the BIOS before, but not since the wipe. The screen just stays black, the computer is on, I'm pretty sure it's at the BIOS screen but not positive. It gets to windows no problem if I just let it boot.

I've tried plugging in the HDMI to the Mobo itself, and into all 4 HDMI slots on both GPUs. I also tried removing the 8pin power connector on the 2nd gpu, but the screen stays black. Any ideas? It's a gigabyte board with 2 RX480 8GB cards in it with an Intel i7 6700k slightly OC.

DEL would seem to be the way in to the UEFI/BIOS with F12 being a route into the specific area of Boot Devices in the UEFI.

If that fancy keyboard is not standard and re-assigns Function keys then you will have to work out what are the equivalent key presses, and whether that function key driver is loaded or not.

A standard basic keyboard is useful tool at this point.

Another way in to the UEFI is Windows 10 Settings.
Settings > Update & Security > Recovery > Advanced start-up > Restart now > Troubleshoot > Advanced options > UEFI Firmware settings.
(there are different routes to do the same thing)

You can remove both the Graphics Cards and use the Intel iGPU HD Graphics, plug your monitor into that MOBO HDMI socket.
That eliminates any added PCI-E Graphic Cards or driver problem.
Then when running OK go back to dealing with the Graphics Cards.