iMac as a secondary display [duplicate]

macos display imac target-display

enter image description here Don’t use a cable like the one shown above! These do not contain the required licensed Thunderbolt chips (inside the connectors) to support Thunderbolt protocol. While they will work for a connection to a DisplayPort only monitor input, they will not support a Thunderbolt Display or iMac in Target Display Mode.

You need a cable that looks like the one below that shows a Thunderbolt Logo on each connector indicating it’s compatibility. I recommend the 2m cable, the 0.5 is too short unless you are comfortable leaving your MacBook closed under your iMac.

enter image description here If your MacBook Pro only has USB type C ports you’ll need to check which of those ports support Thunderbolt 3 and use Thunderbolt 3 to Thunderbolt 2 converter from Apple with a Thunderbolt 2 male-to-male cable to connect it to your iMac.

Here's an picture of the Thunderbolt 2 converter from Apple that'll do the trick.

enter image description here

Also check your MacBook's specs, and be sure to use the Thunderbolt ports, some are only USB C and it can be hard to tell.

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