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Hi guys, the macbook had a pregnant battery a while ago but worked normal.. Now i replaced the battery and the broken touchpad but the screen stays black also the apple logo is not lit but otherwise the macbook powers on.. I have the same model laying around with a dead logic board.. So I swapped the logic board but still the same problem..
Is this a good question?
Rep: 1
2
Ok so I answer my own question for other people. Thx Ifixit comunity -_-
The problem was a defect ram slot. When the ram is removed from the top socket the mac boots normal. Trying different ram in the top socket gave different results, mostly the screen stayed black but with some ram the mac boot just to kernel panic in the mid boot process bcause of something with the nvidia gpu.
So removing one ram fixed the problem of not booting
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