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Oct 14, 2015 12:21 PM in response to thorsenmarkby Linc Davis,Then you have managed to corrupt the system in a way that is not fixed by reinstalling in place.
Back up all data to at least two different storage devices, if you haven't already done so. One backup is not enough to be safe. The backups can be made with Time Machine or with Disk Utility. Preferably both.
Erase and install OS X. This operation will destroy all data on the startup volume, so you had be better be sure of the backups. If you upgraded from an older version of OS X, you'll need the Apple ID and password that you used, so make a note of those before you begin.
When you restart, you'll be prompted to go through the initial setup process. That’s when you transfer the data from a backup.
Select only users and Applications in the Setup Assistant dialog—not Computer & Network Settings or Other files and folders. Don't transfer the Guest account, if it was enabled.
You'll have to recreate some of your settings in System Preferences.