Logged out and unable to log back in

While working on my Mac the computer suddenly logged me out and I am now unable to log back in. When I try to log back on the system logs in for 1/2 seconds before kicking me out to the initial log in page and asking again for the password. I tried shutting down and restarting and safe boot mode but nothing works.
I am however able to log in the account I set up for my son (which is the one I am connecting from).
Anyone knows how to log back in the master account either directly or through my son's account?
Thanks

Hi mazde, and a warm welcome to the forums!
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
Let us know where that leaves us.
Is it a Filevault account?

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