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I was exploring my new fedora 19 after a crash in KDE (I don't know what I just did). I couldn't shutdown my laptop either with the graphical method or the terminal way (because the terminal refused to open). So I forced the shutdown by pressing the shutdown button in my laptop. After I restarted my laptop and entered my password and user, a black screen appeared and went back to logging screen again (the same thing happened with root).

So how should I fix this problem?

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Can you access one of the ttys? At the login prompt, try ctrl-alt-F2 and see if you can log in there. If that's successful, something in X is probably corrupted. –  drs Aug 24 '13 at 20:12
    
Yes it was successful, and What do you mean by X ? . Now 90% i guess the Desktop environment is corrupted . –  Ismail Sensei Aug 25 '13 at 7:52
    
I'm not familiar with KDE, but you can check different log files to see if there are any errors: /var/log/messages or ~/.xsession-errors (if it exists). –  drs Aug 25 '13 at 13:50
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1 Answer

You will have to enter recovery mode and reset the root users password (which may have ended up corrupted). Fedora has an answer on that:

How to reset a root password

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I don't think the problem about the passwords, Cause when i enter wrong password, he refuse to log in, but i make the right password the black screen appear. –  Ismail Sensei Aug 24 '13 at 14:07
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