Outline
Work in a Mac external display, and then sometimes the phenomenon of black splash screen, no reason before to find, finally found, recorded, for future reference, I believe it is useful to others.
References:
Macbook external display settings tutorial
problem
My Mac when an external display is not Mac Close the lid of the display. Today to find information, finally know, this title closing lid mode, in the closing lid mode, it must ensure that the external power supply, or an external display may not be awakened. So splash screen appears and then a black screen may be two reasons for this:
- Voltage instability. Just keep the external power supply is turned on, then close the flip cover is solved.
- External power supply cut off. The re-connected to an external power supply.
Setting the main display
The so-called main display is the display system Dock is located, setting method is very simple, open System Preferences, click on the display, then drag and drop directly on top of the small white bars where the most you can.
Other settings
More settings can be viewed Macbook external display settings tutorial