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?
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Would it be possible to use an M1 iMac as a display for a Windows laptop?
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Not going to happen, Target Display Mode was dropped with the retina iMacs.
support.apple.com
Use your iMac as a display with target display mode - Apple Support
Target display mode is a feature available with certain older Mac models.
TDM only worked from Mac to Mac anyways.Not going to happen, Target Display Mode was dropped with the retina iMacs.
Use your iMac as a display with target display mode - Apple Support
Target display mode is a feature available with certain older Mac models.
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.
You can try 3rd party aps, or tool+aps combo.
Aps => Airserver
Tool + aps combo => Luna Display