Try the cards one at a time? If that works, probable cause might be an IRQ conflict? Are you connecting via the BMC or directly with monitor and keyboard?
Thanks for asking.
I just removed all cards except the Adaptec RAID card.
Still no go.
Physical keyboard/monitor.
Iām seeing similar threads with other motherboard manufacturers (supermicro) but those were resolved with a BIOS update. Iām already on the latest BIOS.
Iāll try updating the card firmware using a donor PC and see what happens. The firmware is pretty dang old.
Update: Iāve been working with Asrock support and they suggest an RMA of the motherboard. Go figure. Iāll post an update if this finally solves the problem. Might be a month before that happens though haha.
Iād be very surprised if RMA would result in anything else other than āyup, our pre-defined set of tests passed, there is nothing wrong with the boardā. I mean I guess itās possible they find something but I wouldnāt hold my breath.
Honestly those kind of problems smell more like one of the following:
- CMS boot settings / legacy devices handling / PXE making the port/keyboard non-functioning during parts of boot
- BMC keyboard settings (in the bios and the bmc itself): maybe there is some sort of selective redirection during some boot stages
- You are plugging in the keyboard to a port that is not functioning properly during boot. Iād try all the available options:
ā the motherboard usb ports
ā Use internal/front-panel usb3 ports
ā add a usb controller card - preferebly usb 2
ā try booting through the BMC
Also: reference this guide for more pointers:
Hi, Iāve got the 4.26 Beta BIOS and a Ryzen 5 3600 CPU.
I think the x4x4x4x4 is a function of the CPU along with the BIOS.
Howdy,
I have a Ryzen 5 3600 and the following BIOS and BMC Firmware:
And my System Inventory looks like this:
All Tabs (Processor, Memory Controller, PCIE Device, PCIE Function, Storage) are empty, EXCEPT for Fans:
Which isā¦ not really what one expects from āSystem Inventoryā.
@Apple2c You have the same issue as I have, but youāre on a newer, but still supported CPU and the latest BIOS+BMC, so what Asrock told me is essentially BS 
Next course of action could be:
a) Iām contacting Asrock again, show them your data and thus calling their BS or
b) you contact Asrock without my involvement, using the data you showed here and report on the answer(s) you get from them
Then weāll await what they say.
@wendell Mind keeping an eye out for this and if necessary use your contacts to get stuff moving? If you provide an email address Iāll forward you my recent exchanges with Asrock Rack Tech support. TIA!
x470d4u2-2t with a Ryzen5 5500 and bBIOS 4.14 I am facing the issue that the onboard X550 has not enough bandwidth:
PROBLEM: PCI Express bandwidth available for this adapter is not sufficient for optimal performance.
ACTION: Move the adapter to a x8 PCI Express slot.
Also was anyone able to upgrade the firmware on the onboard X550? Sadly it is not able to do 2.5 Gb etc. The new driver will show it as an option but it will not work.
Those cards were designed to work with old BIOS, so UEFI + legacy mode doesnāt seem to be working properly.
Iām using a SAS card (HP P800) and it only works in HBA mode (so no RAID config). For the motherboard to post I even had to actively block booting from the OptROM before inserting the card. Anyway, hardware RAID doesnāt make much sense nowadays, youāre just vendor lock-in yourself, better go with ZFS.
I think youāre just wasting time RMAāing the motherboard but, just in case, come back here to keep us updated! 
@Apple2c thanks, Think I might try the beta bios before I throw coin at new CPU.
Edit: it was the CPU, swapped the 5600G for 3600 and the x4x4x4x4 works.