:: puts on Great Karnak turban, presses forehead against original post ::
Ahh, it seems you are using a laptop, and you control the cursor with the touch pad. Further, that the cursor remains immobile in the lhc of the screen as if the touchpad has been disabled.
If that's the case, try plugging in a mouse and see if it can move the cursor.
If that works, open your system settings, and find where the mouse / touchpad are configured. Maybe there's a place to re-enable the touchpad?
In the KDE desktop, it's System Settings -> Input Devices -> Touchpad -> Enable/Disable touchpad.
Also, you might enjoy this thread, "
Gregg's Nearly Interminable Adventures in Linux Land"
HTH
Albert