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sheri156 Author

Level 1

4 points

Setting up Dual imac Screens

I have a 2013 imac running on OS X Ver 10.9.5 that I wanted to use as a dual screen and a 2020 macOS Big Sur Ver 11.7.4 that will be my primary screen. The command + F2 or FN + F2 does not toggle to see both displays, only the brightness on the standard F2 command button. I also can't see the "arrangement" tab under the display. How do I setup dual screens for these 2 imacs? I'm using a apple thunderbolt 3 (USB-C) to Thunderbolt 2 adapter, with a thunderbolt 2 cable.

iMac 27″

Posted on Mar 21, 2023 11:28 PM

Top-ranking reply

Jack-19

Level 8

46,020 points

Posted on Mar 21, 2023 11:51 PM

Hi there!

Unfortunately, you cannot use Target Display mode.

Use your iMac as a display with target display mode - Apple Support

For Target Display mode to work,

The iMac used as a display must have macOS High Sierra or earlier installed.
The other Mac that you're connecting it to must have been introduced in 2019 or earlier and have macOS Catalina or earlier installed.
The cable connecting the two Mac computers must be a Thunderbolt or Thunderbolt 2 cable.

The 2020 iMac is too new.

As an alternative, you could use Luna Display, a third-party option. You'll need upgrade your 2013 iMac to OS X El Capitan or newer (your Mac supports up to Catalina) for Luna Display.

How to download macOS - Apple Support

Jack

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Setting up Dual imac Screens

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