![]() Navigate to ‘System preferences… > Sound.’.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:
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