Why is there suddenly a one inch black margin on each side of my MB Pro?

Suddenly there is this black, one inch margin running down both sides of my view screen. How do I get out of it? It just appeared this morning when I turned my laptop on. Can't find anything in preferences that would eliminate it. tx!

Is System Preferences > Displays set to the native resolution of your display (the top one in the list)? Else, try a PRAM reset:
http://support.apple.com/kb/HT1379

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