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I have the two computers connected with the Thunderbolt cord. But when I hit F2 on the 2011 iMac, nothing happens. Well I shouldn't say nothing happens, the screen flashes as if I were taking a screen grab.

I am using the Thunderbolt Cable, connected by the Thunderbolt 3 USC-C to Tunderbolt 2 Adapter, but am not having any luck.

The 2011 is running on El Capitan and the MacBook is running on Mojave.

Thanks for your help!

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According to Apple you have to press CommandF2 to enter target display mode, not just F2.

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