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Immediately after the chime hold down the Command and R keys until the Utility Menu appears.
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Set the Format type to Mac OS Extended (Journaled.).
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Click on the Erase icon in Disk Utility's toolbar.When Disk Utility loads select the drive (out-dented entry) from the Device list.Select Disk Utility from the Utility Menu and click on Continue button.Immediately after the chime hold down the Commandand Rkeys until the Apple logo appears. Erase and Install OS X Restart the computer.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.Install Combo Updater Download 10.12.6 Combo Update and install.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 below Login Options. Click on the lock icon and enter your Admin password when prompted. Create a New User Account Open Users & Groups preferences.Restart the computer from the Apple Menu.
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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. Repair the disk by booting the from the Recovery HD.You should try each, one at a time, then test to see if the problem is fixed before going on to the next.īe sure to backup your files before proceeding if possible.
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