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crwdns2934241:0crwdne2934241:0 David Cheng

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Screen not turning on

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I have power, keyboard LED's are on but my screen remains black, once in a while, the screen does come back alive for maybe a few seconds, a minute tops before it goes black again.

It works fine when connected to my external monitor via HDMI, as in I can use the device BUT the screen remains black.

Why is this happening and how do I fix it?

Thanks.

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MacBook Pro 15" Retina Display Mid 2015

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open