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Take it in to an Authorized Service Provider and ask them to test it for this repair: https://www.apple.com/support/macbookpro-videoissues/ MacBook Pro Repair Extension Program for Video Issues Apple has determined that a small percentage of MacBook Pro systems may exhibit distorted video, no video, or unexpected system restarts. These MacBook Pro systems were sold between February 2011 and December 2013. Apple or an Apple Authorized Service Provider will repair affected MacBook Pro systems, free of charge. See below for details on affected models and service options. Symptoms An affected MacBook Pro may display one or more of the following symptoms: Distorted or scrambled video on the computer screen No video on the computer screen (or external display) even though the computer is on Computer restarts unexpectedly Products affected 15-inch and 17-inch MacBook Pro models manufactured in 2011 15-inch MacBook Pro with Retina models manufactured from Mid 2012 to Early 2013 Do not use the identify your coverage from this site as it only tells you about your original warranty, not the program.