If you’ve connected a laptop computer, make sure it’s set to display on an external monitor.
If you’re using a PC notebook:
Hold down the Fn key and press the function key that lets you display on an external monitor. It may have an icon such as or it may be labelled CRT/LCD. Allow a few seconds for the projector to sync up after pressing it. Check your laptop’s manual or online help for details.
On most systems, the or CRT/LCD key lets you toggle between the LCD screen and the projector, or display on both at the same time.
If that doesn’t work, press the ? Help button on the projector for a list of laptop brand-specific button combinations you can press to switch to an external display.
Depending on your computer’s video card, you might need to use the Display utility in the Control Panel to make sure that both the LCD screen and external monitor port are enabled. See your computer’s documentation or online help for details.
If you’re using Macintosh OS X:
Open System Preferences.
Click Display or Displays.
Make sure the VGA Display or Color LCD dialog box is selected.
Click the Arrangement or Arrange tab.
Make sure the Mirror Displays checkbox is selected.