10. Install a Fresh Copy of macOS
11. Check for loose screen cable
If the screen cable that connects the logic board to the screen is loose, it could end up with a black Mac screen. Apple used this type of “round" screen cable in MacBook Airs manufactured in or before 2017, and MacBook Pros manufactured in or before 2015.
If your MacBook goes to a black screen after physical impact, and you don’t see any crack on the LCD panel, chances are you have a loose screen cable. Check and clean the screen cable before replacing the screen. Warning: ALWAYS disconnect the charger and internal battery before working with MacBook hardware.
- Remove the MacBook Pro or MacBook Air back cover.
- Remove the charger and battery connector to avoid accidental damage to the Mac.
- Remove the screen cable from the connector on the logic board.
- Use a teeth blush and 99% alcohol to clean the connector.
- Plug in the screen cable.
- Plug in the battery.
Hopefully, this will solve the MacBook Pro black screen issue. If not, go on to the next step.
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