my game wont go full screen and i cant fix it. does anyone know how to fix it?

it was working going on full screen then the power to my house ran out and when it came back on it no longer worked and dint go on full screen mode and it wont let me go full screen either.
 
On the ED start screen along the top under your name you will see "Options" left click on it and in the fold down list click on "Validate Game Files" click on that and let it run its course this will check your ED installation for faults. When it finishes its scan try and start ED again and see if it is okay now.
it didnt work
 
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