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grey screen with an arrow sign floating

Cant boot up MacBook Air. With a grey screen and an arrow that looks like electric sign floating 

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.

最後更新：2017-09-19 15:07:42

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