
Try a PRAM Reset to Resolve the Black Boot Display Some other users on the MR forums suggest that resetting PRAM helped them too, but most power issues are resolved by the SMC reset. This key press solution was discovered by reader Nathan D., who found it tucked away on MacRumors Forums, and it has worked for several other commenters there as well. Wait about 15 seconds, then hit the Power button again to turn it back on.

Hold down the Power button until a hard shut down is forced.
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On any modern MacBook Pro or MacBook Air with a built-in battery, which is just a bout all of them nowadays, this is how you do that: This will dump and reset settings for anything power management related, and is long known to resolve problems with things like fans, heat, sleeping problems, and of course, display issues. The first thing you’ll want to do resolve nearly every power related issue on a Mac is to reset the SMC, or System Management Controller. First, Reset the System Management Controller to Fix the Black Display on Boot Though it’s rare, we figured this would be a good opportunity to share three potential solutions to this problem, and similar issues, should you encounter a dark screen on system start. Case in point one of our readers experience with his MacBook Pro, which out of the blue rebooted to a completely dark screen.
