How can I use my old iMac as an extra display? I have linked them together via thunderbolt. My older iMac is 2012.
How can I use my old iMac as an extra display?
iMac 27", macOS 10.15
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How can I use my old iMac as an extra display?
iMac 27", macOS 10.15
If your 2012 iMac is a 27" iMac, see: Use your iMac as a display with target display mode - Apple Support
If your 2012 iMac is a 27" iMac, see: Use your iMac as a display with target display mode - Apple Support
You can't. It is a computer with a screen, not a dedicated display device.
How can I use my old iMac as an extra display? I have linked them together via thunderbolt. My older iMac is 2012.