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Vertical lines on screen on startup

Turned on my Macbook Pro 17″ 8,3 the other night and the screen looked like this.

 

I called Apple, and the tech had me do a couple of commands which fixed the issue. But I’m trying to figure out that happened. Is it the graphics card? The HD?

 

I’m running the latest version of El Capitan.

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Vertical lines on screen on startup


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