I suggest you check your /var/log directory for the appropriate log and post the rest of the error message. I don't use KDE myself but my guess is you should find something either in one of the Xorg.* logs or a log specifically connected to KDE.
Quote:
How do I get KDE and kernel versions again??
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KDE I don't know, but kernel version, do:
$ uname -a
in the terminal.
Good luck!