I don’t fully understand the cause of the issue but I have a little routine that I do to get things working again which up till this point has been me just trying to repeat what I did the first time it happened where I opened up the computer to do a visual inspection but forgot to unplug it and saw the red lights flashing and when I put everything back together it did the thing where the screen stays black a little longer before it boots up and the ports started working again.
I’m definitely curious if just powering it off and unplugging for 2 minutes instead would fix the issue, though I’m almost certain that I’ve successfully performed my routine in less than two minutes and ended up with everything working though perhaps I’m wrong.
In my case removing the RTC battery or changing bios options has never been necessary. I also haven’t tried the 30 second power button hold.