Can this cable be used to make a iMac 21.5-inch, Mid 2010 a second monitor for a iMac 27-inch, Mid 2010?

Apple Thunderbolt Cable (0.5 m) - White

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  • No. The desired set up cannot be realized by any cable combination because the iMac 21.5 inch does not have target display mode. Furthermore, even if the roles were to be swapped (iMac 27 as secondary display), the Thunderbolt Cable would not work because a Thunderbolt Cable can never be hooked up to a non-Thunderbolt port.

    The only way to connect an iMac 21.5 (mid 2010) to an iMac 27 (mid 2010) would be to use the iMac 27 in target display mode. The correct cable to use would be a Mini Display Port cable, not a Thunderbolt cable.

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