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Target Display mode is also disabled automatically, if you shut down either computer, or if either the Mac or iMac slips into a sleep state. If you want to stop using your iMac as an external display, then you can exit Target Display mode using the ‘Command+F2’ keyboard shortcut, or by disconnecting the MiniPort or Thunderbolt cable. You can then choose the sound level, using your Mac’s audio keys.
Target Display Mode is a feature that’s designed specifically for those who own two or more Macs, as it allows you to use your iMac as the external display for another Mac.