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MacBook Pro models with a 15" display

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Replaced thermal compound, black screen on power up?

Followed the guide to the letter for replacing the thermal compound. Put it all back together and nothing happens when I turn it on. Just a black screen? have I fried the logic board ? what should I do next ?

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Hook it up to an external monitor to test the GPU and video components.

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Richie will be eternally grateful.
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