For the past few months, whenever I shut my computer down fully and leave it off for more than a few minutes, it won't start back up without an elaborate ritual. This is an ordinary shutdown, so the power cable is still connected, and the power supply is still switched on.
When it's in this non-starting state, the power button does nothing; no lights, no fans. However, if I then unplug the machine and wait 5+ minutes, it'll start fine on the first try. The system is otherwise fine.
Worryingly, this occasionally but not always triggers the BIOS recovery feature on my Gigabyte motherboard that detects a corrupted BIOS and reflashes it automatically. I'm worried that some part is headed for a more dramatic failure.
Any thoughts on which component could be causing this symptom?