LightDM Configuration on Arch Linux
After an Arch Linux minimal install and when installing LightDM, one should activate the
line on file
as true before starting the LightDm service. This configures your system to check first if graphics are active before starting the display manager. If you encounter a blank screen and are unable to go to a tty, boot with Arch install media, chroot into your installation and mark this line as true. This solved the problem for me.