The Mac App Store is telling me I have a new security update for my 2009 27" iMac (which maxes out at High Sierra.)
It's downloaded the update, and when I hit Restart, the monitor goes black but I can see and move around the cursor.
Nothing else seems to be happening, and I'm forced to hard restart the machine from the power button.
Haven't had any problems with updates before. Any ideas what I am missing here?
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