Login screen not showing up

[gb spam]

> >>> Does system-config-display work through a ssh session?  I just tried it
> >>> but nothing happens and I had to do a Ctrl-C to kill it.
> >>>
> >>
> >>
> >> it should do.  do you have an X server running where your ssh'ing
> >> from?  maybe you need ssh -X or ssh -Y to ensure X will be tunneled?
> >>
> >>
> >>
> > Actually, I am using putty from Windows XP.
> >
> And no, I don't have cygwin.

from putty, run "telinit 3" that should stop X running and you should 
have a text login on your linux host. log in as root, then run
system-config-display.  after that, "telinit 5" will restart X