10.13.5 update fails with black screen
When trying to update a Mac Pro (Late 2013) to 10.13.5 from 10.13.4 all I get is a black screen with the pointer. Nothing else. I've tried the standard and the combo update with same results. Now my Mac Pro won't even shutdown or restart (always goes to the black screen with the pointer).
Any ideas on what I can do or where I can check if there's any error blocking the update?
Mac Pro, macOS High Sierra (10.13.4)