How to Use an Old iMac as a Second Monitor

If you have an old iMac that you’re no longer using, you can put it to good use as a second monitor for your Mac or PC. Here’s how to do it.

First, you’ll need to gather a few things:

  • An iMac that’s not being used
  • A Mini DisplayPort to Mini DisplayPort cable, or a Mini DisplayPort to Thunderbolt cable
  • An Apple Thunderbolt Display, an Apple LED Cinema Display, or a third-party display that uses a Mini DisplayPort

Once you have those things, you’re ready to get started.

Turn on your iMac and log in. Then connect the iMac to your Mac or PC using the appropriate cable. If you’re using a Thunderbolt cable, it will connect to the Thunderbolt port on your iMac; if you’re using a Mini DisplayPort cable, it will connect to the Mini DisplayPort on your iMac.

Next, connect the iMac to your display. If you’re using an Apple Thunderbolt Display, an Apple LED Cinema Display, or a third-party display that uses a Mini DisplayPort, you can connect it directly to the iMac using the appropriate cable. Otherwise, you’ll need to use an adapter to connect the iMac to your display.

Once the iMac is connected to your display, you should see the iMac’s desktop on the display. If you don’t see the iMac’s desktop, make sure the iMac is turned on and that the cable is connected properly.

You can now use the iMac as a second monitor. To do this, simply move your mouse cursor to the edge of your primary display, and it will appear on the iMac’s display. You can then drag windows and other items to the iMac’s display, just as you would with a secondary display.

You can also adjust the resolution of the iMac’s display by going to System Preferences > Displays. Here, you can set the iMac’s display to match the resolution of your primary display, or you can set it to a lower resolution if you want to conserve space on the iMac’s display.

And that’s all there is to it! With an iMac set up as a second monitor, you can increase your workspace and be more productive. Just be sure to keep an eye on the iMac’s battery level; if it gets too low, the iMac will go to sleep and you’ll lose your second display.

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