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I installed the latest Yosemite upgrade on my 2013 iMac. At the end of the install, it hung up while restarting and I turned it off after an hour. The diagnostics test came out OK. I'm checking in to see if others had this problem and I should do more. I was beginning to chat with Apple Support but lost contact.
Advice?
Another user gave a tip on a different thread-- same question.
If you can open terminal (that is, dock still works although menu bar may be gone), open it.
At terminal, enter
sudo reboot
at the prompt. The password to use is the Mac's management/administrator password.
When it comes back up, go back into the App Store under "Updates" and if the update hasn't finished, continue it from there (I had to hit restart button, and this worked for me).
i have same problem except I am getting blue scree of deadhead .....
I had this problem too. I simply forced shut down the machine and boot it up again. It worked fine. I wouldn't recommend this method though if you don't have some sort of backup.
UNfofrunately that did not Help me
Trouble restarting after installing latest Yosemite Upgrade. It hung up for over an hour
