If your mac may encounter some peculiar issue during system boot that can cause a big panic. But don’t worry. It’s is really to fix this problem.
1. Reset The System Management Controller to Fix The Black Display On Boot
The first thing you will want to do resolve nearly every power related issue on a Mac is to reset the SMC or System Management Controller. 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 display issues.
If your Mac with a built-in battery, this is how you do that:
If your Mac is older, it’s slightly different. Here is the steps.
2. Try a Keypress Sequence to Ditch The Black Screen
OS X has many keyboard shortcuts. If you use them wisely, you can fix this problem. This is how you do that:
3. Resetting PRAM
You can reset the PRAM to fix this but most power issues are resolved by the SMC reset.