well if you uninstalled the Gnome Desktop ,then there is no desktop to login to .
you might be better off doing a new clean install BUT with the current CentOS 6.4
but this may or may not work
-- first you have to upgrade to the ONLY supported version 6.4
there are no 6.3 repos any longer
boot into text only
( add a blank space and a 3 to the end of the kernel line before you boot the system )
hit the "e" during the 3 sec. countdown then use the down arrow to move to the kernel line
hit "e" again and use the error keys to move to the end of the kernel line
add a 3
then hit "b" as in b for boot
log in as root
and run
Code:
yum --releserver=6.4 upgrade
but using the install dvd for 6.4 would be better
that way you can just install the default desktop manager ( Gnome2)