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My iMac starts and it shuts down
Follow the steps, at > https://support.apple.com/en-us/HT204267
Follow the steps, at > https://support.apple.com/en-us/HT204267
If the Safe Mode restart does not help, then please look over Writing an effective Apple Support Question so you understand the information we need in order to help you.
My iMac is not starting
