Had this problem too and finally found the solution. Mac OS switches between them depending on what kind of work you are doing, and by switching cards it saves batteries. By turning this feature off the glitching stopped.
How to Fix Apple’s Blue Screen
Uncheck the tickbox and the flickering stops. As soon as I unchecked the auto adjust brightness the flickering went away. But I would say.. My daughter wants to marry you.. Your email address will not be published.
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Previous Next Sort by votes. Taken from here If you still have problems, try repairing the startup drive using the methods described earlier in this article. Ok I did that and then some other text came up as shown in the image, and then it wen straight to white screen, then 2 minutes of waiting, back to blue, and now its going from black to blue over and over.
I don't really see any error messages on any of those pictures here, so it's difficult to diagnose the problem. If it is still under warranty I would recommend taking it to an Apple Store. If your Mac came with and optical drive then it should have come with an OS X disc.
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Otherwise, you can contact Apple support to see if they will give you a replacement disc for your Mac. Do you have a time machine backup on an external disk? If you do and it is setup correctly you should be able to boot from that.
Pink and Blue vertical lines coming through screen
I generally always have a backup, but if my hard disk crashed and I couldn't even get a recovery console open to reinstall OS X Mountain Lion or boot from my Time Machine backup I would probably "find" OS X "out there" and then reinstall it probably via a bootable usb drive that I create on another computer. If it boots fine off a time machine backup, or a USB disk such as a linux partition on bootable usb then try restoring the internal HDD from the time machine backup, you can do this either by booting off the Time Machine drive, or by booting off the OSx setup CD.
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A blue line suddenly appeared vertically on my screen??? What do I do???
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