- Does this happens to any users whoever tries to login via GUI or to any specific users?
- From runlevel 3, try switching to runlevel 5 and record error messages:
#init 5
- Check if the required package groups are loaded for X display (run the below command)
#yum grouplist|awk '/Installed Groups/,/Installed Language Groups/'
- Check out for space availabilty of /tmp if set as different from root:
#df -PTh /tmp
- Check out if xserver is up:
#ps -ef|grep X
root 112592 112576 0 May28 tty1 00:00:00 xinit /etc/X11/xinit/xinitrc -- /usr/bin/X :0 -auth /root/.serverauth.112576
root 112593 112592 0 May28 tty7 00:00:31 /usr/bin/X :0 -auth /root/.serverauth.112576
- Look out for errors/warning related to "X or display" in /var/log/messages & /var/log/Xorg.* files.