HT201257: Using Apple Hardware Test
Learn about Using Apple Hardware Test
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Helpful answers
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Feb 23, 2015 9:57 AM in response to sam325by OGELTHORPE,The error may not be directly related to the display.
http://support.apple.com/en-us/HT203648
Thew vertical lines suggest problems with the GPU, the display or the display connection. The best option is an appointment at an Apple store genius bar for a FREE evaluation.
Ciao.