@LouisIngenthron
Ctrl+alt+1 to switch tty environments. You will be at a console screen. Login with your credentials and try:
sudo dnf upgrade --refresh
Reboot see if that fixes your issue?
@noflcl After three reboots of the same problem, I switched to Windows and tried opening LinuxMint.
When I went back to Fedora, the problem had mysteriously solved itself.
Still very concerning, though... Just wasted two hours on this, and I have no idea what the issue was or how it was fixed.
@LouisIngenthron
Very strange
@noflcl Huh. Maybe booting into Linux Mint reset some settings or something. Because Fedora lost my system config for mouse sensitivity... Weird.