Sigh. This was probably actually a mistake. I have had one up on my desk for a couple weeks now running fine but it seems to have turned itself off and forgotten its power restore option, which means either the CMOS battery is dead or something is horribly wrong. I can't turn it back on without taking it apart because the power button is busted.
Turns out I never actually replaced the battery in that machine. Ha ha.
I went through all 16 to replace battery, unlock the bios, change to boot on power restore, and run the self check. A bunch have broken power switches, which I knew. Some of them even have broken power LEDs.
Only one has a bad eMMC chip, which is great.
Next subproject is to get a headless immutable USB booting Alpine running.
Also I want to try writing a kernel driver <_<
Pete Keen