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Fix a Mac that will not boot

We'll rule out power, display, and startup disk, then isolate the cause—power fault, display issue, or corrupted disk—or tell you when to call a pro.

Troubleshooting · Home maintenance
15–45 min
What you'll need
  • Known-good power adapter (compatible with your Mac)
Step 1 of 5

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Steps

Goal: Rule out power and adapter, then isolate display or startup disk failure.

  • Confirm the power adapter is connected and the LED (if present) is on.
  • Good: Power confirmed. Proceed to Recovery Mode.
  • Bad: No power—try a known-good adapter.

Check power and adapter

Goal: Rule out power fault.

  • Reseat the adapter at the Mac and wall. Try a different outlet. On MagSafe, the LED should be green or orange.
  • If no power with a known-good adapter, the Mac may have a power fault.
  • Good: Power present. Proceed to Recovery Mode.
  • Bad: No power—call Apple or a technician.

Recovery

Goal: Confirm whether the Mac hardware works.

  • Shut down. Power on and hold Command+R until the Recovery utilities appear.
  • If Recovery loads, the startup disk may be corrupted. Run First Aid and reinstall macOS if needed.
  • Good: Recovery loads. Proceed to Disk repair.
  • Bad: Recovery does not load—hardware fault, call a pro.

Disk repair

Goal: Repair or reinstall the startup disk.

  • In Recovery, open Disk Utility. Select the main volume, run First Aid.
  • If First Aid finds errors, reinstall macOS. This preserves your data.
  • Good: First Aid completes, Mac boots.
  • Bad: First Aid fails—disk may be failing, back up if possible and call a pro.

When to get help

Call Apple or a technician if:

  • The Mac has no power with a known-good adapter.
  • Recovery Mode does not load.
  • Apple Diagnostics reports hardware errors.

Verification

  • The Mac powers on and reaches the login screen or desktop.
  • No blank screen or stuck Apple logo.
  • Startup disk is accessible and macOS loads.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Power and adapter Confirm adapter connected; try different outlet and adapter.
  2. Recovery Mode Hold Command+R at startup; if Recovery loads, hardware is OK.
  3. Disk and NVRAM Run First Aid; reset NVRAM and SMC on Intel Macs.
  4. Call a pro No power, Recovery fails, or hardware errors in diagnostics.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Mac model and year
  • Whether power LED or charging indicator appears
  • Whether Recovery Mode loads
  • Steps already tried

Does the Mac show any sign of power (LED, chime, screen)?

No power points to adapter or battery.

Check adapter at Mac and wall. Try different outlet and cable. Good: LED on adapter or Mac responds—check Recovery. Bad: No power—try known-good adapter.

Yes No

You can change your answer later.

Does Recovery Mode load (Command+R at startup)?

Recovery loads from a separate partition.

Hold Command+R at startup. Good: Recovery loads—startup disk may be corrupted. Run First Aid, reinstall macOS if needed. Bad: Recovery does not load—hardware fault, call a pro.

Yes No

You can change your answer later.

Try a known-good adapter

Use a compatible adapter. If the Mac powers on, replace the adapter. If not, the Mac may have a power fault—call Apple or a technician.

Done

Run First Aid and reinstall macOS if needed

In Recovery, Disk Utility, First Aid on the main volume. If errors, reinstall macOS. This preserves data. If First Aid fails, the disk may be failing—back up if possible, then call a pro.

Done

Call Apple or a technician

No power with good adapter, or Recovery does not load. Run Apple Diagnostics (hold D) if the Mac powers on—note any error codes. Logic board or display replacement may be needed.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a Mac not boot?
Dead battery, faulty power adapter, display fault, corrupted startup disk, or hardware failure. Check power first, then try Recovery Mode.
Can I fix a Mac that will not boot myself?
Yes. Check power and adapter, boot to Recovery, run First Aid on the disk, reinstall macOS if needed. If Recovery does not work, a technician may be needed.
When should I call a technician for a Mac that will not boot?
If the Mac has no power at all, Recovery does not load, or Apple Diagnostics reports hardware errors. Logic board or display replacement may be needed.

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