Why won’t my iMac turn on.
what could be the issue when my IMac won’t power on at all?
iMac 24″, 12.6
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The obvious question is does the power outlet it's plugged into have power?
If so unplug the power cable from the back of the iMac for about 15 seconds. Plug it back in and try powering up. If that works, even for a short time before it shuts down again you have a failing or failed power supply.