I can't switch to any of the console screens. I can't even CTRL+BKSP and kill X. The only way to get out is to power down!!
A better solution would be to try to kill any KDE / kdm / X process via ssh from another PC (Laptop?) - if you have one.
I don't see anything strange in .xsession-errors, /var/log/messages or dmesg. Google doesn't really have anything useful that I've found.
You should also look into /var/log/Xorg.0.log. Look for any lines that begin with (EE).
You can also try to edit your xorg.conf (or XF86config, if you still use that; x.org uses this file if xorg.conf is not found) and change your graphics driver from nv / nvidia to a more generic one (Although the point of hanging doesn't indicate a graphics problem... but you can still try it!)
Tim ___________________________________________________ . Account management: https://mail.kde.org/mailman/listinfo/kde. Archives: http://lists.kde.org/. More info: http://www.kde.org/faq.html.