I have Fedora 30 (upgraded over time starting from 28) and after the recent upgrade from 29 to 30, the system no longer works after a reboot, only after a full power down.
What happens when I reboot (i.e. when I type "reboot" as root in the terminal and hit enter) is that after the POST check, the system hangs on a black screen with the text cursor blinking in the top left. I left it on for the whole weekend, no progress.
When I simply boot from a full power down, the system shows no defects. What's odd is that, when I press the physical reset button during the hanging scenario, is that the next boot procedure fails in the same manner, so there must be something that persists somewhere in the system.
I tried everything in grub.cnf but it just doesn't respond to anything in the reboot scenario. Not a single echo command will show anything on the screen.
Why can I only boot after a full power down?