what is most common reason for Mac Mini to stop powering on?
it simply won't turn on, even after trying to "Force on power" by holding power button for more than 10 seconds?
iMac 27″, macOS 14.7
No power from the outlet.
(check other devices in that wall outlet)
A loose or failed power cord.
(check the power cord on the back of the Mac mini)
A failed power supply inside of the Mac mini.
(take the Mac mini to your local Apple Service Provider for service)
For more on the subject, have a look at > If your Mac doesn't turn on - Apple Support