Unit crashed while running a general update. I caught a glimpse of an error about the kernel before it went black. Now won’t boot. It spins up the fan for a second and shows the BIOS screen but then the fan shuts off and the screen shows a blinking _ and then the unit gets really hot. It’s not being recognized by my host PC and won’t boot to USB, there’s no recovery button so I can’t reflash it. I’ve swapped cables and done all the Tier II helpdesk stuff. I don’t want to mess with the board. Anyone have any advice?