Old iMac as second monitor for Macbook Pro 2017 (2 usbc ports)
Can I use my old iMac late 2013 as a second monitor for my macbook pro 2017? I have a cable but it does not work. Am I missing something?
MacBook Pro
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Use your iMac as a display with target display mode - Apple Support
If the iMac is running Mojave or Catalina you will have to erase it and install High Sierra.
You will need a Thunderbolt 3 adapter
https://www.apple.com/ca/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter
and a Thunderbolt cable.