Originally Posted by hadimotamedi
how can I remove it from the boot up list to reach the root user prompt(..)?
Either 0) boot into a non-multi-user runlevel by appending " 1" or " single" to the end of your GRUB command line on boot, 1) boot into interactive mode by pressing SHIFT+i when asked or 2) boot from a Live CD. Once you're in you can use 'chkconfig --level 12345 [servicename] off' or its systemd equivalent to keep the service from booting. Note that removing and re-installing is a pre-Linux (Windows, mostly) reflex that doesn't help you gain the knowledge to solve things.