How To Connect a Video Projector to a Mac

Connect your MacBook DVI or Micro-DVI cable to the side of your MacBook. Consult your Mac's documentation if you are unsure which jack you have. Connect the other end of the cable to your video projector.
Switch the projector on.
Click the Apple logo on the taskbar, then click 'System Preferences.'
Click 'Displays.' Click 'Detect Displays.'
Select the new display and change the resolution to the highest available. You now have two displays ready to use with your MacBook.
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