Stuck with the same issue and it’s not the first time I encountered it with my U59Pro.
In June 2024 I had the same problem and spent days troubleshooting and went through the slow process of getting a bios update file, installed it and the issue got better but didn’t completely go away. On restart it would hang with no display output for a couple of minutes but eventually POST and boot into Windows. Annoying but at least I could use the computer.
Today I tried to do a Windows update and the box froze at the very beginning of the update, no display, no responding to any inputs. Left it for about 10min and nothing changed. Forced a restart and now the box just boots with 100% fan speed and nothing happens. No POST, no display, no responding to inputs.
Tried leaving it unplugged for a while, resetting the CMOS, leaving it run for 15min and nothing will get it to POST. Just sit there with the fan running 100%.
Another two people having the similar issue here:https://forum.bee-link.com/forum.php?mod=viewthread&tid=90531&extra=page%3D1&page=1
EDIT: It seems to have come back to life again for some reason, after leaving it unplugged for 20-30min and plugging back in it booted. Tried to update Windows again and same crash and not booting. Guess I’ll have to plan a reinstall soon. This mini PC ended up being so time consuming.