I cannot imagine that this problem affects all MacPros end 2013, but it certainly affects my one.
Upgraded several weeks ago to 10.11 and had the same day to downgrade back to Yosemite.
The Mac could only be shut down by the power button (or by pulling the power supply cable).
Clicking in the apple menu to shut down (or to restart) made only disappear the menu bar.
The El Capitan background image and the dock remained.
Waiting brought nothing. Only the On/Off power button allowed to close the operation of the MP.
Now I have just tried the 10.11.1 version (but this time to avoid the past problems I did it not in the inner drive but in an external USB 3 HD).
Besides that everything took of course much, much longer (!) than when using the inner drive, I found no change to the lack of possibility of a normal "booting down" of the OS.
Still the only way is by cutting the power supply.
On this occasion I received from Apple a software update.
However to install it required that the computer restarts, as often is the case.
Since restarting requires finishing first the computer's operation, and, as already explained this is not possible in my case, this update could not be installed.
Under Yosemite I never experienced anything of this kind and the same applies to Mavericks and previous OSX I had.
It ONLY happens now under El Capitan, so there must be something in this OSX which causes at least in my specific MP 6.1 (since I don't know how other MPs 6.1 manage with 10.11) this very serious problem...
I must confess I lack the knowledge to develop a strategy to deal with this.
Any help how to find out the reason (or reasons) behind this strange situation, the necessary first step to find the solution to it, will be very warmly welcome.
Thank you very much in advance!
Ed
Upgraded several weeks ago to 10.11 and had the same day to downgrade back to Yosemite.
The Mac could only be shut down by the power button (or by pulling the power supply cable).
Clicking in the apple menu to shut down (or to restart) made only disappear the menu bar.
The El Capitan background image and the dock remained.
Waiting brought nothing. Only the On/Off power button allowed to close the operation of the MP.
Now I have just tried the 10.11.1 version (but this time to avoid the past problems I did it not in the inner drive but in an external USB 3 HD).
Besides that everything took of course much, much longer (!) than when using the inner drive, I found no change to the lack of possibility of a normal "booting down" of the OS.
Still the only way is by cutting the power supply.
On this occasion I received from Apple a software update.
However to install it required that the computer restarts, as often is the case.
Since restarting requires finishing first the computer's operation, and, as already explained this is not possible in my case, this update could not be installed.
Under Yosemite I never experienced anything of this kind and the same applies to Mavericks and previous OSX I had.
It ONLY happens now under El Capitan, so there must be something in this OSX which causes at least in my specific MP 6.1 (since I don't know how other MPs 6.1 manage with 10.11) this very serious problem...
I must confess I lack the knowledge to develop a strategy to deal with this.
Any help how to find out the reason (or reasons) behind this strange situation, the necessary first step to find the solution to it, will be very warmly welcome.
Thank you very much in advance!
Ed
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