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I have a new MacBook (spec attached) and I'd like to connect it to my old iMac (spec also attached).
My iMac is a late 2015 so I can't use Target Display and the MacBook is
just USB-C. I can connect a cable that is USB-C to USB-C and I can
easily turn Screen Mirroring on my iMac shows up on my MacBook just fine
but there's no option to reverse it.
Any help would be much appreciated.
iMac 21.5″
It is not possible to use the iMac as a wired external display, as what you're saying: target display mode is not supported.
What you can try configure your iMac as an airplay receiver see this link on how to do that Set up your Mac to be an AirPlay receiver - Apple Support
Please note that the 2015 iMac is not fully supported for airplay to Mac (you'll need a 2019 or later for full support) so it could not work or a bit trial and error to get it working
Toon_79 wrote:
It's odd that I can share my screen from iMac to Macbook but not the other way around.
A M2 MacBook Air running Sonoma meets the system requirements to be an AirPlay Receiver for AirPlay to Mac. A Late 2015 iMac, even one running Monterey, doesn't.
System requirements for Continuity features on Apple devices - Apple Support
Set up your Mac to be an AirPlay Receiver - Apple Support
AirPlay from Macs to Apple TV set-top boxes has been around for a much longer time than AirPlay to Mac, so the Late 2015 iMac probably can act as a transmitter even if it doesn't support acting as a receiver.
Luna Display (Astropad) and Duet Display may be options for a second display. You would have to check their system requirements. Neither is the same as a first-class hardware connection to a real display.
It's odd that I can share my screen from iMac to Macbook but not the other way around.
On my iMac there is an option to add a screen...
On my Macbook there isn't...
On iMac but not on MacBook...
So I followed the link to set up AirPlay on both iMac and MacBook but it doesn't say how I share my screen?
Would duetdisplay.com be an option?
Duet looks the only way Luna is clocking in at $130. I could buy a decent PC screen for that.
Note that Duet Display is a rental - if you rent long enough, those charges are going to add up.
Using my old iMac as a screen-only
