Some Thoughts On Diagnostics
You should come to a text-mode login. Before logging in, try entering CTRL+ALT+F7. You should return to your KDE display. If you click on something now, does it work?
If that does not work, go back to your x-term session (CTRL+ALT+F1), and poke around in your logs
sudo tail /var/log/syslog and sudo tail /var/log/messages. Also check the output of dmesg | less. There might be something tell-tale there indicating what is wrong.
If you see X config errors, you'll probably need to reconfigure, and that is yet another step.
Last edited by cmnorton; 02-15-2009 at 03:22 PM.
Reason: fix sentence