[This was posted in the thread about the spate of security-related updates that did not include Mojave, so I’m guessing that it’s associated with Security Update 2020-03. -Adam]
I received notice of an update for my Mac Pro running Mojave. I initiated the update. The process seemed to be working like all other updates. Then it shutdown like it was going to restart. Then it never started. Black screen. Let it run for half an hour. Never came back.
Shut it down, then tried restarting, with the same results.
I recently replaced the video card with an RX580. It worked just fine for over six months this way until this update.
Beware of this update. I really would like to know how to get my Mac working again.
Val Pistilli