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How to use iMac as an external monitor If you have got an iMac made in mid-2011 or later, then one issue you'll be able to do with it's to use it as an external monitor. just like Target Disk mode, where one Mac's internal hard drives will be mounted as external drives via FireWire or Thunderbolt to a different system, Target display mode permits an iMac's show to be captured and utilized by a second macintosh.