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 R keys until the Utility Menu appears. Repair the disk by booting from the Recovery HD.Start the computer in Safe Mode, then restart normally.Reset the System Management Controller (SMC).Disconnect all third-party peripherals and remove any support software like drivers and plug-ins.Shutdown the computer, wait 30 seconds, restart the computer.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.
You say you tried to startup from the Recovery HD but could not.
