Why does my screen go black?

Question

Occasionally my monitor (MacPro) goes blank for no explainable reason. I jiggle the mouse and it comes back on. I still do not know why this happens but I now know when it happens. I can control it. When I mouse over to and off the bottom or top left corner of the screen, it goes black. Not the left side – just the extreme corners. This does not happen on the right side. Any ideas??

Answer

That might be your settings for Mission Control. You probably have the left corners set to “put display to sleep”

  • Open System Preferences > Mission Control
  • You probably have the left corners set to “put display to sleep”
  • Change the Active Screen Corners to “-”  (no action)