If Xwindows seem frozen, the following simple key strokes may bring back the Xserver without the need for a reboot
Two ways to kill the Xwindows session (Xserver)
(1) press "ctrl + alt + backspace"
If xdm been running, a new X server will be spawned immediately and prompts with the login screen
(2) press "ctrl + alt + F2"
It brings up a a virtual console; login and run:
# ps -ax | grep startx
It will give you the PID of the Xserver. Just kill it with:
# kill -9 <PID>
To go back to the first console, just press "alt+F1"
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