mount -o remount,rw / (might have used only w)
lilo.conf - Check boot parameter is correct /dev/sd* matches where drive is connected.
run lilo from /boot (if need be use lilo -b /dev/sd* where sda is the drive not the partition.
Check root = /dev/sd* is the correct partition
Check /etc/fstab has correct /dev/sd* entries
