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installed new screen and image only appears on external display via

i recently purchased a new screen for my macbook pro A1278 and when i finished installing it the display still does not work but when connected externally it works perfectly fine.

Note: the screen is brand new....

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What was the reason you bought the screen in the first place?


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Can you see a faint image on the screen when shining a flashlight thru the Apple logo? If so you have a inverter and/or inverter cable issue.

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