Mirror Displays when Connecting to a Projector

Ever see an empty desktop appear on the screen when connecting your macbook laptop to a projector? This happens because the two displays (computer screen and projected image) are not configured to mirror each other. There are two ways to mirror displays when connecting to a video projector (or other external display):

1) Quick Way - Command + F1

Arrangement window in System Preferences

2) Long Way - From the Apple () menu, choose System Preferences.

• From the View menu, choose Displays.

• Click the Arrangement tab.

• Enable (check) "Mirror Displays" in the bottom-left corner.

Some people like to have their desktop not mirrored with the projected image so they can open documents or other files on their computer and not show this on the presentation screen. They can still do their presentation with the file / document off the edge of their computer screen; I find it takes a bit of getting used to as you can't see the presentation on the computer screen.