If you suspect it is your hard drive or SATA cable to hard drive you can check it by installing your hard drive in an external case. About the screens you see when your Mac starts up - Apple Support You did not say what was showing on your screen when your computer shutdown. Click on the Apply button, then wait for the Done button to activate and click on it.
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Set the Format type to Mac OS Extended (Journaled.).Click on the Erase icon in Disk Utility's main window.When Disk Utility loads select the volume (indented entry, usually Macintosh HD) 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. Install Sierra or El Capitan from Scratch If the above cannot be done then try this. Select Install OS X and click on the Continue button.Īlso, see this User Tip: Basic Steps for Upgrading OS X.Quit Disk Utility and return to the Utility Menu.Wait until the Done button activates, then click on it. Click on the First Aid icon in the toolbar.Select the indented (usually, Macintosh HD) volume entry from the side list.Select Disk Utility and click on the Continue button.Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Reinstall Sierra or El Capitan Without Erasing Drive "Disk Locked" is often a sign that the disk has become corrupted or needs replacement.
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