My AsRock Rack ALTRAD8UD was DOA :(

Hi! My Ampere Altra Q64-22 + AsRock Rack ALTRAD8UD does not POST or power on.

I've stripped the board of everything but two sticks of known-good RAM and the CPU. I've also tried two known-working power supplies. I also tried manually clearing the CMOS. I also measured the CMOS battery, and it's reading 3V DC, as expected.

IPMI via OpenBMC works fine, I get a ping and can open the web UI, but the Power status in the web UI is "unknown" no matter what I do, with the CPU installed in the motherboard. Every sensor and health check in the web UI passes. I just cannot get it to power on no matter what I do (even tried manually bridging the front panel connector power pins), and there's no VGA output no matter what I do.

As an experiment, I even removed the CPU. Interestingly enough, the CPU health check passes with the CPU removed, AND interestingly enough, the Power status now goes to "green".

At this point, it's either the board or the CPU that is DOA. How can I further diagnose this? Is there anything I can do to help repair this at this point???

I really just want a working Ampere build, this is so disappointing to spend $1500 on parts, and it doesn't work. I thank you in advance for and really appreciate any help...

Curious if you resolved this? I have the same issue on two separate ALTRAD8UD-1L2T boards. So far I've only tried to power it with a psu, but will try with 12V power