Set the Format type to Mac OS Extended (Journaled.).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.
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. Possible Fixes for El Capitan and Later Installations