When you get to the log-in screen, try this:
This will get you a "virtual terminal" with a command-line prompt for you to log in with. Can you log in there? If you can, then the problem is with the GUI program that's trying to log you in. If you can't, then we need to look elsewhere.
If you can log in at the CLI, then replace the display manager:
yum remove gdm
yum install gdm
If you can't, then log in as root. Then try resetting the password with
Last edited by DavidMcCann; 09-04-2012 at 12:50 PM.
Reason: extra information