Blank UEFI/BIOS, no splash screen, no Boot Menu£n

Thanks so much for the adise. I've been busy through a holiday time.

Found one odd set of instructions, for a different Bios/motherboard, which I'll try tomorrow:
https://forum.asrock.com/forum_posts.asp?TID=5555&title=solved-ab350m-pro-4-uefi-settings-black-screen

SOLUTION TO PROBLEM:
Problem: UEFI settings not able to be accessed via Windows, no ASRock Boot Logo w/settings. Computer will just restart back to windows or show a black screen when booting to UEFI settings from Windows 10. This issue may apply to some AMD GPU's using Displayport and the UEFI Settings by default booting to your monitors native HD resolution. This must be disabled for you to be able to consistently boot back into UEFI Settings.

Solution:
Instructions(for dummies):

1. Power off computer completely and disconnect power, remove any externally powered analog speaker cables hooked into the jack.
2. Press the power button for 15 seconds to discharge the capacitors. Discharge any static or wear a static wrist band and pop the case open.
3. Under the second x8 PCI-E slot and at the bottom center of the Mobo, you will see a 3-Pin connector with a jumper on it. Remove the jumper and move it ONE PIN to the right.
4. Wait 5 seconds and move the jumper ONE PIN to the left.
5. Reconnect power and boot.
6. UEFI ASRock Splash Screen will show once and one time only so hit F2/DEL and boot to UEFI **WHEN THE LOGO APPEARS** HITTING F2/DEL BEFORE THE LOGO APPEARS WILL CAUSE THE SPLASH SCREEN NOT TO APPEAR AND YOU WILL HAVE TO RESTART AT STEP 1!!
7. Once in UEFI navigate to "Advanced" and use the down arrow until you highlight "Full HD UEFI"
8. A selection box will appear, select disable and hit enter.
9. Navigate to the "Exit" tab and select "Save Changes and Exit"
*Computer reboots and may display the post screen or just go to Windows*

If no splash screen appears, do not worry this is a integrated fast boot feature windows uses.

Boot to UEFI from Windows 10:

1.Log in to you machine and right click the Windows Start Logo
2. Mouse over to "Shut down or Sign Out" and over again to restart.
3. Press and hold LSHIFT while clicking restart. Windows will now boot to the Troubleshooting screen.
4. Once in the troubleshooting screen, click the "Troubleshooting" box and then the "Advanced Options" box.
5. Now finally, click the "UEFI Firmware Settings" box and then "Restart", your machine will boot into the UEFI (After disabling the HD Feature).


So i hope this helps guys, ASRock if you need any info from me please let me know. I'd like to work with you to have this fixed in a future BIOS update. This could cause a less computer savy person to RMA their board or write a nasty review.


_____
Then there's using the AMI FIRMWARE UPDATE (AFU) to update the BIOS via Win10...

I'll try the first, and if needed the AMI UTILITY tomorrow.

Thanks in advance for trying to help!

I'll tell you what happens when I'm sober and ready to slowly, carefully, patiently try to upgrade the CPU.

For the record, I was totally sober when I tried, swapped out video cards, rebooted countless times... just at the moment I'm kinda drunk and appriating the AMD Win10 Bios update tool which I had no idea exists.

It's such a small thing. A little better performance, some more life out of a consumer product. Wish it was easier. Not giving up, just not now with so much cabernet sauvignon flowing though me.

I give up... no idea when or how the AMI Bios quit displaying, but this motherboard is going into the trash.

It worked great for 3.5 years, which isn't what I expected, but still not terrible.

Looked around for a replacement and chose one on sale, ASRock B550M STEEL LEGEND AM4 AMD B550 SATA 6Gb/s Micro ATX AMD Motherboard.

If that doesn't support my 5000 Ryzen out-of-the-box, nor my old 1700 to update the BIOS... I'LL!!!! ...be even more frustrated and just send it back and buy another brand.


WHY IS UPGRADING MY CPU SO IMPOSSIBLE?!??!

Very Frustrated, were you ever able to get into the UEFI/BIOS? If so, by chance was "Fast Boot" turned on? If so, the "Restart to UEFI" utility might get you into something you can see.

I just went through this after upgrading to Win 11 and needing to get in to enable secure boot to satisfy a game requirement. Similar to others, I am running two monitors. One hdmi and one displayport. It looked like it was booting into UEFI mode but just a black screen. Here's what I did. It took three boots to figure out:

Disconnect the HDMI monitor and plug in the display port, alone, in the first position, and reboot from within windows choosing the UEFI mode on the reboot. That's it. No resetting cmos, nothing else special. Just dropping to the single monitor and rebooting.

I had tried, unsuccessfully, on previous boots:
Trying every available port, both hdmi and displayport, while it should've been in UEFI mode
Hdmi monitor alone, in the only port on my 2070 super, and in the mobo hmdi port. separate boots.
Display port monitor but in another port on the card.

It only worked, for me, in the right most port on my card, with no other monitor plugged in. And now I'm back to regularly scheduled programming. :)
Hope it helps someone.