Reboots after ipgrade to a blank screen with mobile mouse. This is a 2011 IMac

Invited, let the operating system to download the 10.11.12 upgrade of the app store and start the download. When asked to reboot I did. A white screen with a mouse moweable. Restart again with shift, gave the same result. New reboot did not improve the situation. Will I wipe the hard drive IMac and reinstall from my Super Duper backup?

Any other suggestions?

Resolve startup problems-

Resolve startup problems - (2)

Resolve startup problems - (3)

Tags: Mac OS & System Software

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