MacBook pro Screwup

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Jan 4, 2015
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i have attemptedd to create dual displays from my macbook pro to a dll monitor i connected them via a thunderbolt-DVI adapter and it worked until i rotated the 2nd screen and now i can't change it back. System preferences shuts down when i try to. Is there any way to reset the settings n the dell or to fix this problem?
 

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