I have a 2011 iMac running High Sierra 10.13.6. When performing this security update my computer freezes in the middle of the restart. Are there any known fixes.
When attempting to perform Security updates (both 2020-003 and 2020-004) my iMac freezes in the middle of the restart process.
2011 iMac
High Sierra 10.13.6
1) I attempted to perform the update and when the update restarted the computer, the iMac restart froze.
2) The freeze acts like the following: Once the computer has shut down all the apps the screen goes black for approx. 3 seconds; then the cursor shows up and can move but the computer was frozen - black screen only. Also, the Apple timer that is normally present during shutdown is never seen.
3) I now needed to remove power and restart the computer.
4) Once restarted the iMac functions normally, however when I attempt to shut it down again the iMac it again freezes requiring me to remove power.
5) On one attempt to installed the Security Update I left the computer in this frozen condition for 2 hours with no change, thinking the update may take a while.
6) I can get the iMac to stop freezing on shut down by using the following commands in Terminal:
sudo rm -f /Library/Preferences/com.apple.loginwindow.plist
sudo rm -f /private/var/db/.AppleUpgrade
sudo rm -f /private/var/db/.SoftwareUpdateAtLogout
sudo reboot
However Security Update 2020-004 still shows it needs to be performed.
Anyone else seeing this? I have seen this issue on other boards with no resolution.