For restarting a Mac with black screen conduct a reset of the system management controller, shut down your Mac and get it connected to your Magsafe adapter and also to a power outlet then hold the shift+ control +option + power button for a few seconds, then get all the keys released at the same time after that boot the Mac and the issue will be resolved. If you still need any sort of help or support then connect at Apple contact number UK.
Updated: 13 August 2019, 11:02 AM
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