Blank screen when entering BIOS, but Windows Boots fine on ASUS CH7

Hello,

I wanted to check the bios settings and I have suddenly found out, that when I press DEL to enter BIOS, the display is blank. Monitor is On, it has signal, but with blank black screen. Computer starts normally, beeps, displays the AMI initial screen and normally boots into Windows. If I press DEL however, instead of going to BIOS, I get blank screen.

Baseline:

• AMD Ryzen 2700X / ASUS Crosshair 7 WIFI
• BIOS 2008
• Windows 10 PRO 1809

Troubleshooting done:

• Monitor to any other display output (only this one is on, others are off)
• Different VGA
• BIOS reset - did not help, although it was reset. I got message that BIOS was reset, press F1 to enter bios, but then - the same issue.
• BIOS Flashback update - After pressing the button, it blinks 3 times, then turns on, which should be OK. BUt nothing is happening - the led on USB stick does not blink. Whan I interrupt, the PC works as before.
• EZ Update in Windows - after submitting to update the bios, it restarts, but then enters the BIOS, which is - blank. After restart, all works as before (with black BIOS)
• Entering BIOS from Windows (Shift-Restart) does have the same effect

I am out of ideas now - the PC works, just can't get into BIOS to change anything. Of course, now, I have the default settings loaded because of few BIOS resets.

Interesting is, that when in BIOS, I am getting 0d on the postcode - changes to this after entering the BIOS. In the manual, this value should be reserved for future AMI BIOS errors.

Any hints?

Have you tried going through Windows?
Settings/update and security/recovery/advance startup
the computer will reboot
and bring you to the repair menu choose troubleshoot/advance options/ uefi firmware settings (or bios)
restart
that should take you into the bios.

Yes, i did (last bullet point in "Troubleshooting section". and the result was the same, BIOS entered, however with blank screen.

But I have just tried again the Bios Flashback function - pressing button on the back plate with USB flash in and this time, it worked and I can get into the bios now. Not sure, maybe I misspelled the name before while renaming or the flash drive needed clean format.

I am not sure however what caused the issue - the computer normally worked and this behavior could be for longer time, I just discovered it yesterday, when I tried to enter to BIOS after some time.

Not sure if it was issue of the 2008 version or if it can happen anytime again.

Do what I do .. keep a notebook of methods ,tweaks,tips and solutions

yeah, i will definitely keep that flash disk working for bios update