Can you adjust the iMac's brightness via Displays System Preferences while it's in Target Display Mode? What Mac is connected to the iMac? Even if the target display mode, only the brightness of the screen keyboard, the volume and sequence of keys Display Target Mode is active. All other keyboard will be ignored. USB, FireWire,.
![]() You can connect any of these older iMac models to another Mac for use as an external display. Learn how to identify your iMac model.
Target display mode requires macOS High Sierra or earlier. It does not work with macOS Mojave or later.
How to use target display mode![]()
If target display mode doesn't work
If your iMac doesn't show the desktop of your other Mac, try these steps first:
If that doesn't work, try these other solutions:
Learn more
. Make sure that your iMac is started up and meets the system requirements above. Make sure that the other Mac is started up and logged in to a macOS user account.
Connect the two computers using the appropriate Mini DisplayPort or Thunderbolt cable.You can use more than one iMac as a display, if each iMac is using a Thunderbolt cable to connect directly to a Thunderbolt port on the other Mac (not the other iMac). Press Command-F2 on the keyboard of the iMac. You should now see the desktop of the other Mac.
To exit target display mode, press Command-F2 again. Or disconnect the cable, or restart either Mac. If your iMac doesn't show the desktop of your other Mac, try these steps first:. Restart your iMac. Restart the other Mac. Unplug the Thunderbolt or Mini DisplayPort cable from the other Mac, then plug it back in. Press Command-F2 on the iMac.If that doesn't work, try these other solutions:.
If you're currently logged in to the iMac that you want to use as a display, choose Apple menu Log Out to return to the login window. Then press Command-F2 again. Choose Apple menu System Preferences, then click Keyboard. If ”Use F1, F2, etc. Keys as standard function keys” is selected, target display mode uses Command-Fn-F2 instead of Command-F2. It might also help to use the keyboard that came with your iMac.
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Some third-party keyboards and older Apple keyboards don't support target display mode. Make sure that your iMac is using. You can't use target display mode with later versions of macOS, or with.
To use the built-in speakers of your iMac to play audio from the other Mac, choose Apple menu System Preferences, click Sound, then click Output. Select the iMac as the device for sound output. You can then use the sound and media keys on the keyboard of the other Mac to adjust volume and control media playback. To control the brightness of the iMac display while it's in target display mode, use Displays preferences on the other Mac, or the Brightness keys on the keyboard of the other Mac. Apps that were open on your iMac when entering target display mode remain open in target display mode. For example, if you begin playing music on your iMac and then enter target display mode, the music doesn't pause on your iMac. The other Mac can't use the iMac computer's built-in camera or ports.
To use external devices with your other Mac, connect them directly to the other Mac, not to your iMac. If the other Mac goes to sleep, the iMac screen turns off until you wake the other Mac or exit target display mode.
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