See if you can boot into single-user mode:
When the GRUB menu appears, hit any key to stop the countdown. Then "e" for edit. To the line beginning with "kernel", add the word "single" at the end, and then reboot ("b" in grub). Once it is running, look at /etc/x11/gdm/gdm.conf and tell us what's there.
You can also boot from a live CD and look at this file.
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