the cause of this problem is the graphic driver is override by some other software update.
you should download some driver that suit your graphic card and then reinstall.
1. press Ctrl+Alt+F2 (Ctrl+Alt+F8 and BackSpace I can't remember meaning)
then close x server by command "/etc/init.d/gdm stop"
2. sudo ./your driver.run
3. "etc/init.d/gdm start or restart"
Finish then "sudo shutdown now" if you can't back to normal graphic mode = ="
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