ROMED8-2T/BCM Won't power on anymore

I have an ASRock ROMED8-2T/BCM motherboard. I bought it new.
It has been working correctly for a year and a half with 4 x 32Gb 2933Mhz ECC RDIMMs and an epyc 7282 and a corsair AX 1600i as PSU.

Then when I turned on this morning it didn't work as expected.

I have no POST, no debug codes, no bmc heartbeat leds, I plugged both the motherboard LAN1 and BMC to the router as usual. Neither is detected, the ethernet port is blinking orange on one side for the LAN1. But it is blinking from both sides on the BMC port. Still not detected by the router,, not trying to receive a DHCP lease.

The weirdest thing is when I try to turn it off by holding the power button it doesn't turn off. Even a minute later.

I cleared the CMOS battery, now I can reach the BMC. But I cannot update BIOS (gives me verify bios error). I downloaded 3.80 from the asrock website. Nor can I turn on the server, it appears as "Powered Off" in KVM of the BMC. Clicking on "Power On Server" does nothing.

And I still have no way of turning it off by holding the power button, only by turning off the PSU.

Thanks for your reply. I followed the same steps to actually get the BMC to work. It didn't work before. I didn't even get the BMC heartbeat LED. Then once inside the BMC I didn't see anything in logs. I tried the PSU self test which was green. I don't know what else to try. I'll change the CMOS battery and let you know.

Thanks for your insight? Any other stuff I can do to rule something else out? Changing CMOS battery did nothing. And I didn't know dead CMOS batteries caused issues like this. I thought the system would still boot or at least try to.