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macrumors 6502a
Original poster
Sep 15, 2019
London, UK
I intend to use my iMac as both my personal computer and an external monitor for work. However my work laptop is a MS surface pro, what's the best way to do that with an M1 iMac?


macrumors 68040
Sep 23, 2005
Yes, the 2009-2010 iMac supported TDM.

Sad that Apple didn't allow that for 2012+ iMacs..
Some did.

You can connect any of these older iMac models to another Mac from 2019 or earlier for use as an external display. Learn how to identify your iMac model.
27-inch iMac models introduced in 2009 and 2010: Use a Mini DisplayPort cable to connect your iMac to a Mini DisplayPort or Thunderbolt or Thunderbolt 2 port on the other Mac.
All iMac models introduced in 2011, 2012, 2013, and mid 2014: Use a Thunderbolt cable to connect your iMac to a Thunderbolt or Thunderbolt 2 port on the other Mac. If the other Mac uses Thunderbolt 3, you can use the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter with your cable.
Target display mode requires macOS High Sierra or earlier on the iMac used as the external display. It does not work with macOS Mojave or later.


macrumors member
Feb 17, 2008
Luna Display still does not work with Retina and may never will (bandwidth?).
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