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To hear your Mac’s audio through the iMac speakers: On your Mac, navigate to ‘System preferences… > Displays.’ Make sure the ‘Display’ tab is selected, and then manipulate the ‘Brightness’ slider.

Use your Mac’s brightness keys to change the screen brightness levels.If you want to increase your iMac’s screen brightness, you can either: You may also get positive results from restarting your iMac. Log out of your iMac, and then log back in, to see whether this addresses the problem.If in doubt, try disconnecting and then re-attaching the cable. Double-check that the Mini DisplayPort or Thunderbolt cable is properly connected.On the iMac that you want to use as your external monitor, press the ‘Command+F2’ keys, which should launch Target Display manually.If it doesn’t enter this mode automatically, there’s a few fixes you can try: Connect the Mini DisplayPort cable or the Thunderbolt cable to each Mac.Īt this point, your iMac should recognise the digital video signal, and enter Target Display Mode automatically.On your Mac, log into your macOS user account, if you haven’t already.

Make sure your iMac and Mac are both connected to a power source, and switched on.

Activating Target Display ModeĪssuming you meet all the above requirements, you’re ready to make the connection: You’ll also need to be running macOS 10.6.1 or later. If your iMac has a Mini DisplayPort, then you’ll need a Mini DisplayPort cable. If it has a Thunderbolt 3 (USB-C) port, then you can connect using the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter. If your iMac has a Thunderbolt port, then you’ll need a Thunderbolt cable. To use Target Display Mode, you’ll need to connect your iMac and your Mac, via the correct cable.ĭepending on your model of iMac, it may have a Mini DisplayPort or a Thunderbolt port:

Target Display Mode is a feature that’s designed specifically for those who own two or more Macs, as it allows you to use your iMac as the external display for another Mac.