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Start up disk can't be found

My mac can't find the start up disk. When I restart in recovery mode, disk utility says the start up disk is ok and doesn't need repair. But start up still can't see the disk. What should I do? 

Please try the following, in order. Stop at the step where the issue is resolved:

  1. Reset your Mac's SMC.

    • Reset the System Management Controller (SMC) on your Mac - Apple Support
    • Fans, keyboard backlight, status indicator, battery indicator, display backlight, power button, close/open the lid, sleep or shut down, battery doesn't charge, MagSafe indicator light incorrect status.
    • Hold down the <shift><control><option> keys, and then, press the power button. Hold all of them for, at least, 10 seconds.

  2. Reset your Mac's NVRAM.

    • How to reset NVRAM on your Mac - Apple Support

    • Resets sound volume, display resolution, startup-disk selection, time zone, & kernel panic information.

    • <option><command><P><R>

  3. Boot up your Mac in Safe Mode.

  4. Boot up your Mac in Recovery or Internet Recovery Mode.

    • When at the initial Recovery Mode screen, select the Disk Utility option.

    • Run Disk Utility > First Aid to verify the startup disk's integrity.

  5. Boot up your Mac in Single-User Mode.

    • At the command prompt, type: /sbin/fsck -fy <return>

      • If fsck makes any repairs, you will get a message that says: Files System was modified. If you do, run fsck again until the "The volume <volumename> appears to be OK."

    • Type reboot at the prompt to exit Single-User Mode.

  6. Run either Apple Hardware Test (AHT) (pre-2013 Macs) or Apple Diagnostics (2013+ Macs) to uncover any hardware issues with your Mac.

  7. Make a Genius Bar appointment at your local Apple Store.

最後更新：2017-10-25 06:48:09

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