From your profile description i see you are using Cinnamon. Is that still correct? Is the lightdm service enabled? Also this might help, if related to that issue
If you don’t have that file, then there’s something seriously wrong with your installation. /etc/mkinitcpio.conf is essential for rebuilding the initramfs whenever the kernel gets updated, and without an initramfs you cannot boot ─ it contains all your needed driver modules.
Try reinstalling mkinitcpio.
Only warning: These 3 seem to be in the wrong section (please see at arch wiki)
Error: So it seems lightdm stopped because Xorg server does not work propperly
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