iMac won't start

Please read the info in https://support.apple.com/en-us/HT204267, if you still cannot start it, please take it to your local Apple Authorized Service Provider.

gr-3S0m3 Said:

“iMac won't start: I unplugged, moved and replugged my new iMac. Now it will not restart.”

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Give it a Few:

Let it sit for some time in an open location (i.e. not in the corner and not in an enclosed room). See if it then powers on. Having been plugged in for some time, it’s circuitry may just need to quiet down.