2017 27" iMac intermittent shutdown

How do I confirm that the problem is the power supply in my 2017 27" iMac?

It shuts OFF completely after it has been ON for a while. Seems to be more often since the weather is warming up.

But one of the key items is that I must 'unplug' the AC power cord for several minutes before it will power back ON.

There also seems to be concerns with the CPU and GPU thermal paste drying out. I will try that fix, but I’m still thinking the power supply needs replacing as well.

I have done older iMac repairs and upgrades, so I am OK inside the system.

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I would start off by running the onboard diagnostics, restart your system and press the D key to enter.

Reference: Mac startup key combinations Did you get any errors?