Extreme4 Z390: 5 beeps when no screen is attached

Hi AsRock team,

I made some progress that gives me suspection, that the issue is caused by the motherboard. Here is why:

1. Reassembing the PC didn't brought any progress


2. Updating UEFI to 4.10 didn't solve the issue


3. Enabling Compatibility Support Mode in UEFI causes, that system boots every time - no more five beeps


4. If the display is attached to any of digital ports, it must be turned on within the first seconds since powering PC, to be recognized by motherboard


5. If the display attached to digital port was not recognized at POST time, the PC must go over power cycle - hard or soft reset does not bring it to life


6. The same applies to display attached to discrete card(!)


7. The issue does not occur for analog port on motherboard(!)

Are there any settings, that are giving priority to analog port over digital ports? Is there anything I could do to make digital ports be default one?

maciejos78 wrote: @RLGL too late... I already updated it to 4.10 and it fixed the issue. Why don't you recommend going to 4.10?

Did you not read the fine print? I realize you had an issue but it is possible the latest version prior to 4.1 may also have fixed it.

@RLGL too late... I already updated it to 4.10 and it fixed the issue.
Why don't you recommend going to 4.10?

I noticed also, that my motherboard runs the oldest firmware version 1.60P from 29th of August 2018, while the most recent is 4.10 and just few weeks old. I see that there are a lot updates for Intel Microcode - I will update it today and keep fingers crossed for solving the issue.

Dear Maciejos78,

Thank you for choosing ASRock.

Regarding your case, 5 short beeps usually means CPU problem.
We provide some suggestion to try.
1.     Clear CMOS to load BIOS default.
Please remove the power cord, and follow the user manual p20 to clear CMOS.
http://asrock.pc.cdn.bitgravity.com/Manual/Z390%20Extreme4.pdf
2.     Only install CPU and one stick memory to check if the system can boot into BIOS properly.
3.     Please try to install one stick memory at A1, B1, A2 and B2 slot to check if the system can boot into BIOS properly.
4.     Reinstall CPU and check if CPU socket pin is fine.
5.     If it is possible, please change another CPU or DRAM to check if the system can boot into BIOS properly.

Thank you!
Yours truly,
ASRock TSD