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Thank you all I have used the linked procedure - http://www.asyncro.com/2014/03/24/macbook-pro-discreate-graphics-card-issue-fix-updated/ Although while rebuilding the drivers cache it has given me down the line "segmentation fault" but when it booted: I have noticed in Energy Saver "Automatic switching check box was removed now".Also My external video ...


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I also have a mid-2012 15" rMBP and have seen similar problems intermittently for the pst couple weeks. I only notice it on startup. On the bad startups, the screen stays black and the computer won't start. The issue persists on reboot, smc reset, pram reset for an hour or two and then goes away. Today it started again. After I got it booted in recovery, ...


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I had the same problem and disabled the drivers in single user mode. However it seems that macosx still uses the external GPU if you do that in some low performance mode, instead of using the internal GPU. This solved my problem: http://www.asyncro.com/2014/03/24/macbook-pro-discreate-graphics-card-issue-fix-updated/ The key is to first let your macbook ...



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