When I reconnected the power cord and turned on the iMac with the power button on the next morning, I could see the log-in screen, enter the password, and then a muddy picture with a unusually slow moving progress bar, which run (filled) completely, but the screen did not progress, as typically, to open a functional Desktop (picture) with the Dock.
During the next weekend I’ve Shut Down the computer, then turned it off with the power button and unplug the power cord overnight. I’ve recognized that on November 29, 2017, Apple Released a Security Update for macOS High Sierra and installed it on the iMac in the background (without consent). Few weeks ago, on an Apple 21.5” iMac Desktop Computer (4th-Generation, late 2013), I installed the just released macOS High Sierra v.10.13.1.
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