回答“Does not turn on”For those who find this post, I think I found the one-stop article that may help us bring mac mini back to life. -Restore T2's bridgeOS. I successfully restored bridgeOS. Don’t have to take it to genius bar ever. Follow this link. Not that easy, but helpful. https://mrmacintosh.com/how-to-restore-bridgeos-on-a-t2-mac-how-to-put-a-mac-into-dfu-mode/
回答“Does not turn on”I had the same problem TWICE! After shutdown my mac mini, it just won’t turn on. I took it to genius bar, they changed the motherboard to fix it finally. I don’t think the motherboard was totally broken but some chips may too fragile to keep the system up for a very long time. I mean months. For data in your system, because SSD was soldered on chip, A Time machine is A MUST!