since last update system does not boot any more

[Chuck Anderson]

On Fri, Apr 01, 2011 at 09:44:03PM +0100, mike cloaked wrote:
> It is also useful to know how to rescue a failed X session after
> booting and in the middle of a graphical problem once logged in.
> 
> On the old (current!) days you could switch also to a non-graphical VT
> and enter telinit 3 to go into runlevel 3 during a normal session or
> if X broke, and then reenable runlevel 5 by telinit 5. Is there going
> to remain an equivalent after f15 release - i.e. will switching to say
> VT 3 using the standard shortcut still be possible - and then I guess
> login as root and do systemctl stop prefdm.service and then systemctl
> start prefdm.service to reenable the graphical screen?

This is all documented here:

http://fedoraproject.org/wiki/Systemd

systemctl isolate multi-user.target

(or)

systemctl isolate runlevel3.target