SallyP
Level 1
(5 points)
Q: Mac won't restart after latest security update
Hello, I upgraded my imac (late 2009) to El Captitan a few days ago and everything went well and I had no problems using it after the upgrade.
Yesterday I tried to update the latest security fix (2016-001 10.11.6) and now it won't re-start. I get a bright grey screen with a circle with a line through it.
Can anyone help please?
Imac 27", Mac OS X (10.6.4), mac book pro
JovonaP.
Community Specialists
Hello SallyP,
Thank you for using Apple Support Communities. It's my understanding your seeing a circle with a slash symbol when trying to start your iMac. I use my iMac everyday and I'd be very concerned if it didn't successfully start up. I am happy to help.
This particular screen means your Mac couldn't find a valid System Folder to start up from. I recommend trying to reinstall OS X by using OS X Recovery. Please follow the steps below.
To start up from OS X Recovery, hold down Command (⌘)-R immediately after turning on or restarting your Mac. Release when you see the Apple logo. If you can't start up from OS X Recovery, try holding down Option-Command-R to start up from OS X Internet Recovery*.
Startup is complete when you see the OS X Utilities window
Once your Mac is in OS X Recovery, choose Reinstall OS X from the OS X Utilities window, then follow the onscreen instructions.
Also here is some very helpful information about the different screens that display when starting up.
About the screens you see when your Mac starts up
Have a great day!
