Reboot (or any genius HELP, I just tried to install the latest update for current version of Mac Os (bug fixes?). Mac Mini 202 version. This was on THURSDAY this week. The update required a reboot as usual. the scroll bar came on screen and was showing progress so i left the computer to do other things intending to come back later. When I got back LATE in the day trhe was an error message saying I need to reboot, did so. Since this was late at night I went to bed. I did not get around to checking the computer until yesterday pm and then saw the Scroll bar showing the progress at about 92-95 % and the apple logo but nothing else. When I got up this morning it was exactly the same. Obviously something is not working. How do I get this rebooted so I can go back to PRIOR to the sw update and recover my backup?
I have NOT tried to do anything without some expert advise. Can't afford to lose my backups
Run Disk Utility first from there to check for drive errors. Might as well Repair Permissions too. After that quit Disk Utility and it will take you back to the 4 choices window.
One of the choices will be to Reinstall OS X, you can reinstall without losing any data, it will just reinstall the OS. Since you did an Upgrade I don't know if it will reinstall Sierra, or what you had on it before. BTW it will take a while as it will need to re-download the installer.
If you have a Time Machine backup you can choose to Restore from it to get you get you back to where you were before the Upgrade. It will take a while also as it has to rebuild the drive.
Can't afford to lose my backups
That part I don't understand though. If you're talking about what's on the HD now that isn't a backup, that's the original source data. If you're talking a Time Machine Backup you won't lose that, that's a separate drive.
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