HT202488: Apple Thunderbolt cables and adapters
Learn about Apple Thunderbolt cables and adapters
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All replies
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Helpful answers
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Dec 22, 2013 4:47 AM in response to NYOUNG75by mende1,Welcome to Apple Support Communities
Only 27-inch iMacs and Thunderbolt iMacs can use Target Display mode, so they can be used as external displays. As your old iMac is not a 27-inch one or a Mid 2011 or newer one, you cannot use it as an external display with a cable.
Instead, another way of using your old iMac as an external display for your new iMac is by using ScreenRecycler. It does the same, but you need to have both computers connected to the same network