Keep asking me to Sign In

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http://forums.fedoraforum.org – I signed in as usual. The screen kept black for a moment. Then a sign-in box appeared again. And I signed in again. It kept like the above over and over again. I tried signed in with the right password and the wrong pw. Still cannot boot to my desktop. I also rebooted. And rebooted using previous kernel. Still the same. Really an emergency! I have a whole bunch of college application deadlines this week. GREAT THANKS to any helpful suggestions! (HowTos)