![]() For a Desktop Mac (iMac, iMac Pro): Unplug the power cable. ![]() Let go of the keys and boot your Mac again. While your Mac is still shut, press the Shift + Option + Control and Power keys simultaneously. ![]() Press and hold the power button Press and hold the power button on your Mac for about 10 seconds.Shut your Mac down. If your Mac has no built-in display, make sure that your external display is connected to power, connected to your Mac, and turned on. Make sure that your power cable is undamaged and plugged securely into your Mac and a working electrical outlet.
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