When the Utility Menu appears select Reinstall OS X then click on the Continue button. Reinstall OS X by booting from the Recovery HD using the Command and R keys.Download and install the OS X El Capitan 10.11.6 Combo Update or 10.12.6 Combo Update or Download macOS High Sierra 10.13.6 Combo Update as needed.If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
Upon completion log out of your current account then log into the new account. On the left under Current User click on the Add button under Login Options. Click on the lock icon and enter your Admin password when prompted. Create a New User Account Open Users & Groups preferences.Repair permissions on the Home folder: Resolve issues caused by changing the permissions of items in your home folder.Restart the computer from the Apple Menu. Quit Disk Utility and return to the Utility Menu. Click on the First Aid button in the toolbar. Select the indented (usually, Macintosh HD) volume entry from the side list. Choose Disk Utility and click on the Continue button. Immediately after the chime hold down the Command and Rkeys until the Utility Menu appears. Repair the disk by booting from the Recovery HD.
MAC OS X STARTUP DISK DOWNLOAD HOW TO
How to invoke and interpret the Apple hardware tests - CNET.
Test in safe mode to see if the problem persists, then restart normally.
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