And... it also seems that I finally managed to get the board to keep its BIOS settings.

That literally took over an hour to solve that.

It originally started with it not responding with the power button, then eventually I walked off to retrieve something (over two minutes), then tried again and realized it powered on...

Set the time and date, exit, power off the board then the PSU... wait ~2 minutes, power on the PSU, then the board. Forgot its settings.

Repeat this ad-nauseam between testing RAM for errors and CPU temp. Oh, and the display would glitch up at times. May have to retire that particular old Sony SDM-HS94P monitor.

Earlier, I disabled the BMC by jumper; the BMC was still zombie-enabled, but now the BIOS would no longer acknowledge it. Odd.

Eventually jumpered the Chassis Intrusion setting and then used the Set User Default settings in BIOS. From there, BMC was no longer running...

The board is in standby; it needs a SATA drive before the system migration.