OS X has failed to install on my macbook pro and now it keeps trying to install when the computer restarts and I cannot get back to how it was and ditch the upgrade! Can you tell me how to do this please?
MacBook Pro, iOS 7.1
It is so annoying as I need to do my emails and can't now!
If you don't already have a current backup, back up all data, then reinstall the OS.* You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used.
If you use FileVault 2, then before running the Installer you must launch Disk Utility and select the icon of the FileVault boot volume ("Macintosh HD," unless you gave it a different name.) It will be nested below another icon with the same name. Click the Unlock button in the toolbar and enter your login password when prompted. Then quit Disk Utility to be returned to the main screen.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
*The linked support article refers to OS X 10.9 ("Mavericks"), but the procedure is the same for OS X 10.7 ("Lion") and later.
How do you backup if the computer is not functioning?
OS X has failed to install and now it asks to restart but it just keeps trying to install and I can't quit it.
