MP 1,1-5,1 Mac Pro 5,1 won't shut down and gets stuck on software update

[Zwhaler]

Hello all. My Mac Pro 5,1 2.93GHz 12 core with Pulse RX 580 on the latest Mojave as of last week recently developed a strange problem. When I go to Apple -> Shut Down, it goes all the way to the screen being black but won't make the last step of actually shutting down. It will sit for 12+ hours like that, fans on like normal, but won't turn off. I noticed this about a week ago.

There haven't been kernal panics or any recent hardware changes that I can point to as the cause.

So, I've been holding down the power button to shut it off. It turns on like normal.

As I post this, I tried installing the latest Mojave supplemental update today and the screen is stuck on "Installing Software Update" with the progress bar stuck at about 5%. It hasn't budged in an hour. What is going on?

 

[Zwhaler]

Hello all. My Mac Pro 5,1 2.93GHz 12 core with Pulse RX 580 on the latest Mojave as of last week recently developed a strange problem. When I go to Apple -> Shut Down, it goes all the way to the screen being black but won't make the last step of actually shutting down. It will sit for 12+ hours like that, fans on like normal, but won't turn off. I noticed this about a week ago.

There haven't been kernal panics or any recent hardware changes that I can point to as the cause.

So, I've been holding down the power button to shut it off. It turns on like normal.

As I post this, I tried installing the latest Mojave supplemental update today and the screen is stuck on "Installing Software Update" with the progress bar stuck at about 5%. It hasn't budged in an hour. What is going on?

I got the update to work by installing and then doing a normal restart from Apple -> Restart instead of hitting Restart from within the software update pop-up.

Computer still won't turn off via Apple -> Shut Down though.

edit: the problem appears to have resolved itself sometime after installing the latest supplemental update from late August 2019.