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How can I get my iMac to turn on
iMac 21.5″, macOS 10.13
Follow all of the steps at > https://support.apple.com/en-us/HT204267
Follow all of the steps at > https://support.apple.com/en-us/HT204267
Pull the power cord out of the back of your iMac for about 10 seconds and plug back in. Then try the power button.
If that works but it shuts down by itself and won't boot up without pulling the cord you have a failing power supply.
My I Mac won’t start up
