Usually when X/KDE crashes you hit Ctrl+Alt+Backspace to restart X or Ctrl+Alt+Fn to restart kdm from a tty.
But, what to try when this doesn't work?
The only time I had such issue was my fault because I used akregator with an incorrect syntax in a shell:
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Source code
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1
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akregator http://some-feed.rss
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A look at the man page shows that this command is not supported when written in this way. On my computer this creates some kind of crash where KDE does not freeze, although keystrokes and mouse clicks are not interpreted anymore (including the shortcuts for going to a tty). Still, the mouse pointer still moves and hover effects are displayed on the desktop.
The only way I found out of this is to press the hard reboot button.
I wanted to know, what to do to recover without rebooting in this sort of situation, when you are on a graphical session and the keystrokes an mouse clicks do not respond.