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Can I add a second display to a 2012 iMac?
iMac 21.5″, macOS 10.15
Click on this link to read how to use external monitors with your Mac' --> Connect a display to your Mac - Apple Support
Click on this link to read how to use external monitors with your Mac' --> Connect a display to your Mac - Apple Support
Yes it can run a second display on a Mini DisplayPort adapter.
Depending on the display inputs, you can use,
a Mini DisplayPort to DisplayPort cable.
a Mini DisplayPort to HDMI adapter.
a Mini DisplayPort to DVI adapter.
a Mini DisplayPort to VGA adapter.
Can I add a second display to a 2012 iMac?
