In VirtualBox after upgrading Centos 6.3 to 6.4 the server would freeze after the graphical start-up bar moved all of the way to the right.
I dropped into single user mode on the server and ran init 5
The start up process would hang after posting “Starting atd [ok]”
I rebooted back to single user mode and went to see what service followed atd
I looked through /etc/rc5.d which lead me to rc.local being the last script to run
Nothing of significance was trying to run in rc.local
I made the assumption that the problem must be with gnome.
I ran startx
I received the message （EE）module ABI major version (10) doesn’t match the server’s version (13)
I went to /etc/X11/xorg.conf and mv’d it to xorg.conf-old
I then rebooted and the issue was resolved.