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MacBook Pro 2011 shuts down during start up

my MacBook Pro suddenly started shutting down about 3/4 of the way of start up. I've reset PRAM. Reset SMC. Tried starting up in safe mode (it shut down again). Tried starting up in recovery mode. Ran disk first-aid. (It failed). Tried to restore/reinstall MacOS but it said disk was "locked"?  I'm at a loss. My last back up was over a month ago and I don't want to restore from it if I can help it.

 

Help.

"Disk Locked" is often a sign that the disk has become corrupted or needs replacement.

 

Reinstall Sierra or El Capitan Without Erasing Drive

 

       Please be sure you back up.

 

  1. Restart the computer. Immediately after the chime hold down the Command and R keys until the Utility Menu appears.
  2. Select Disk Utility and click on the Continue button.
  3. Select the indented (usually, Macintosh HD) volume entry from the side list.
  4. Click on the First Aid icon in the toolbar. Wait until the Done button activates, then click on it.
  5. Quit Disk Utility and return to the Utility Menu.
  6. Select Install OS X and click on the Continue button.

 

Also, see this User Tip: Basic Steps for Upgrading OS X.

 

If the above cannot be done then try this. It will erase everything on the drive:

 

Install Sierra or El Capitan from Scratch

 

     Backup if possible before continuing.

 

  1. Restart the computer. Immediately after the chime hold down the Command and R keys until the Apple logo appears. When the Utility Menu appears:
  2. Select Disk Utility from the Utility Menu and click on Continue button.
  3. When Disk Utility loads select the volume (indented entry, usually Macintosh HD) from the Device list.
  4. Click on the Erase icon in Disk Utility's main window. A panel will drop down.
  5. Set the Format type to Mac OS Extended (Journaled.)
  6. Click on the Apply button, then wait for the Done button to activate and click on it.
  7. Quit Disk Utility and return to the Utility Menu.
  8. Select Install OS X and click on the Continue button.


How can I back up when I can't turn the computer on?? And if I erase, won't that wipe out everything I have on my hard drive???

最后更新：2017-08-20 05:34:08

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