My computer is in a totally useless state, as I can not boot at all. What I did was I tried to join my root, boot and home partitions into one. I copied the files, updated the grub config and /etc/fstab and recreated the initramfs, all this from a live Fedora environment. Now I can't boot, instead the system hangs at an endless loop printing something like (typing it here from memory) "[FAILED] can't start systemd journal service" over and over again.
What can I do to fix my system?