Quote:
...and normallay i use to login as root.
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Maybe that's the problem
Generally it is not necessary and also dangerous to login to the graphical system as root. Some distributions do not even permit this. I know, this does not help you with your current problem, but may prevent some problems in the future. With root permissions you can mess up your system very easily. Try to become root temporary with commands like su, sudo or kdesu (if working in KDE).
To your problem: did you have a look in the suggested error file? What does it say?