HT202696: About your support coverage and service options
Learn about About your support coverage and service options
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Helpful answers
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Sep 9, 2016 6:12 PM in response to jrhoppe1by Stuart423,If your iMac will not restart, you can try resetting the system management controller. Reset the System Management Controller (SMC) on your Mac - Apple Support
You might also reset the NVRAM: Reset the System Management Controller (SMC) on your Mac - Apple Support
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Sep 9, 2016 8:39 PM in response to jrhoppe1by John Galt,From How to turn on or turn off your Mac - Apple Support::
If you can't shut down your Mac because it isn't responding, you can force it to turn off without shutting down. Hold down the power button for 5 seconds, until your Mac turns off. Use this method only when you can't shut down. You'll lose any unsaved changes to documents that you have open.
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