Mac restarts after the last security update

Hello, I upgraded my imac (late 2009) to El Captitan, a few days ago and everything went well and I had no problem to use it after the upgrade.

Yesterday I tried to update the last security fix (2016-001 10.11.6) and now it will not re - start. I get a clear grey screen with a circle with a line through it.

Can anyone help please?

Hello SallyP,

Thank you for using communities of Apple Support. It is my understanding of your light a circle with a bar symbol backslash when you try to start your iMac. I use my iMac every day and I would be very concerned if he does not start correctly. I'm happy to help you.

This particular screen means that your Mac could not find a valid system folder from upward. I recommend that you try reinstalling OS X using OS X Recovery. Please follow the steps below.

To boot from OS X Recovery, hold down the command (⌘) r immediately after start-up or that you restart your Mac. Release when you see the Apple logo. If you can not boot from OS X Recovery, now try the Command + Option + R key at the start of the OS X Internet Recovery*.

Start-up is finished when you see the window OS X Utilities

Recovery of OS X

Once your Mac OS X Recovery, choose to reinstall OS X OS X Utilities window, and then follow the instructions on the screen.

Also, here is some very useful information on the different screens that display when starting.
On the screens you see when your Mac starts up

Have a great day!

Tags: Mac OS & System Software

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