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.
SYSTEM BOARD FOR LATE 2011 MAC BOOK PRO INSTALL
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 OS X El Capitan 10.11.6 Combo Update or Download macOS Sierra 10.12.5 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. Quit Disk Utility and returnto the Utility Menu. Click on the First Aid button in the toolbar. Select the indented (usually, Macintosh HD) volumeentry from the side list. Choose Disk Utility and click on the Continue button. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. 
Repair the disk by booting the from the Recovery HD. 
Start the computer in Safe Mode, then restart normally. Reset the System Management Controller (SMC). 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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