Get a second-life from an old iMac by turning it into a monitor for a new Apple Mac computer. This feature shows you how to use one Mac's monitor as a display for another Mac.

Read: How to Speed Up an Older iMac In any case, if you happen to have a spare iMac lying around and need a second display, here’s how to use an iMac as a second monitor.

If you have an iMac made in mid-2011 or later, then one thing you can do with it is to use it as an external monitor. Similar to Target Disk mode, where one Mac's internal hard drives can be ...

It's a shame, then, that Apple doesn't build video input jacks into its iMacs—these all-in-one computers have a built-in monitor, and it'd be nice to be able to use it with other systems.