Does the iMac need to be shutdown for it to work as an external display?

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    No, hit Command + F2 to enter "Target Display Mode"

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  • No. Target Display Mode can be activated while the iMac is running by pressing Command-F2 on the iMac.

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  • No the iMac stays on and runs in the background. To activate boot the iMac and just plug in the display cable. There is a key combo to see either the target display or iMac display

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