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Old iMac as external monitor

To use a late 2009 27 inch iMac as external monitor, must you have an adapter or can you use a chord with Mini DisplayPort on one end and USB C on other?

iMac, macOS 10.12

Posted on Sep 12, 2021 6:31 AM

Reply
4 replies

Sep 12, 2021 7:51 AM in response to Jeanette_ottley

Jeanette_ottley wrote:

I just bought a new iMac. I want to use the old iMac as external monitor. All the videos I’ve watch say you have to use an adapter. But my question is, can you just use a chord, Mini DisplayPort from old iMac to USB C to new iMac. I found a chord with those ports.

It won't work. See the document linked: Use your iMac as a display with target display mode - Apple Support.


Old iMac as external monitor

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