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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Vertical Colored Lines On Startup Screen

Hey all,

When turning on the power, the macbook pro screen’s white page has many vertical colored lines and will not display anything else. Eventually the many multicolored lines fade and a much thicker conformed line in the middle of the screen develops and does not disappear. The macbook pro is will not bypass this screen.

Thank you.

-Eddie

Answer this question I have this problem too

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Can you post a few images of both conditions Adding images to an existing question

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Hook it up to an external monitor to help isolate the GPU issue.

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have you tried reconnecting the cable

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Ed Murray will be eternally grateful.
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