My iMac won't turn on
desktop computer won't turn on
[Re-Titled by Moderator]
iMac 21.5″, macOS 10.13
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Almost certainly a hardware failure. If the link provided does not help please take it to your local Apple Authorized Service Provider to be professionally diagnosed. If the iMac is older than a 2017, don't spend money on it, it's time to replace it.
My iMac won't turn on