I've a couple of #Mac Minis (2014) that are for scrap, how do I force them to boot from a USB key so I can install #Debian on them?
I can get into the system rescue thingy but I can't make it boot from there.
Holding Alt on a PC keyboard doesn't give me a boot menu like every one says...
They are pretty worthless as Macs but could be useful running #Linux on a project, being small.