Prohibitory sign during boot, after update 20.03.2015

System Yosemite last Version, HW MacPro 3.1.
After the in AppStore recomendet update yesterday (20.03.2015) the boot stops with a  gray prohibitory sign.
All by Apple described help did not help.
The last option would be re-install. But then how install donloaded Yosemite - will be an other question.

Boot to the Recovery Volume (command - R on a restart or hold down the option/alt key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Then re-install the OS.
OS X Recovery
OS X Recovery (2)

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