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Can I use the iMac 2015 as a second screen for my 2018 MacBook Air?
I have tried using a conversion from mini port to HDMI and from MacBook Air to HDMI and connecting both using an HDMI cable and it does not seem to work.
Please suggest if I can use something else for this to work.
No, you cannot use that 2015 iMac as a display. Target Display mode is not supported on the 2015 iMac.
Only a few Macs could be used like this. The feature is no longer supported.
Use your Mac as a display - Apple Support
From the document linked above:
"Note: Target Display Mode isn’t supported on iMac models with Retina display. Only iMac (27-inch, Late 2009), iMac (27-inch, Mid 2010), and iMac (Mid 2011 to Mid 2014) support Target Display Mode."
No, you cannot use that 2015 iMac as a display. Target Display mode is not supported on the 2015 iMac.
Only a few Macs could be used like this. The feature is no longer supported.
Use your Mac as a display - Apple Support
From the document linked above:
"Note: Target Display Mode isn’t supported on iMac models with Retina display. Only iMac (27-inch, Late 2009), iMac (27-inch, Mid 2010), and iMac (Mid 2011 to Mid 2014) support Target Display Mode."
iMac 2015 as second screen for 2018 MacBook Air
