If you ever project from your laptop or use multiple monitors at your desk, you may have experienced frustration when your desktop suddenly doesn't quite display the way you want.  Here are some simple tips to help you master this valuable technique on Mac and Windows.

When using multiple displays, you'll need to decide whether you want to Duplicate (Mirror on Macs) or Extend your displays.

  • Duplicate (Mirror) - This option causes whatever is on your primary display to be duplicate exactly onto your secondary display. For example, this is what you might use if you wanted to show a PowerPoint presentation and be able to see your own slides without having to look up at the projected image.
  • Extend - This option causes your secondary display to be an empty extension of your primary display. This allows you to manually move windows over to your secondary display, and still have different windows on your primary display.  For example, this mode is useful if you wanted to show a YouTube video to your audience, while at the same time looking over an agenda on your primary display that you didn't want your audience to see.

If you do not get a picture on both your laptop and the projector screen:

  • Windows - Hold down the “Windows” key (usually located on the bottom left of the keyboard between Ctrl and Alt) and then press the letter "P". This will bring up the different display modes, and you can choose which one you want.
  • Mac - Navigate to System Preferences > Displays > Arrangement and then check or uncheck Mirror Displays according to your needs.

For more information on using displays in classrooms, see our Knowledge Base resources on Classroom Technology, and if you have any questions or need assistance, please contact the IT Service Desk at 508-565-1435 or via e-mail at service-desk@stonehill.edu.