iMac won’t power on
I started my iMac and as it was booting it shut off and there is no power.
iMac 21.5", macOS 10.13
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Please try the troubleshooting in What to do if your computer won't turn on . However if there is no power at all and no video then this sounds like a failed power supply. Please take the computer to your local Apple Store or independent Apple Authorized Service Provider to be diagnosed and repaired.