macOS Won’t Boot

Common “won’t boot” symptoms

• No power at all: No chime, no fan, no screen backlight.
• Stuck on Apple logo: Progress bar never finishes or freezes.
• Endless restart loop: Mac restarts over and over.
• Question mark folder: macOS can’t find a startup disk.
• Spinning globe: Internet Recovery trying to load macOS from Apple’s servers.

Step 1 – Check power and connections

Start with the simplest things. A surprising number of “dead” Macs are power or cable issues.

1. Verify the outlet: Plug in a lamp or phone charger to confirm the outlet works.
2. Check the power adapter: Inspect for damage, bent pins, or frayed cables.
3. Try another outlet or adapter: If available, test with a known‑good charger.
4. For laptops: Charge for at least 10–15 minutes, then try powering on again.
5. For desktops (iMac/Mac mini/Mac Studio): Make sure the power cable is fully seated on both ends.

Step 2 – Force a restart

If the Mac is frozen or stuck on a black or gray screen, force it to shut down and start fresh.

1. Press and hold the power button for about 10 seconds until the Mac turns off completely.
2. Wait 5 seconds.
3. Press the power button again to turn it back on.

If it still won’t pass the Apple logo or progress bar, continue to the next steps.

Step 3 – Try Safe Mode

Safe Mode loads only essential system components and can bypass some software problems.

Apple silicon (M1, M2, M3 and later)

1. Shut down the Mac completely.
2. Press and hold the power button until you see “Loading startup options”.
3. Select your startup disk (usually “Macintosh HD”).
4. Hold the Shift key and click Continue in Safe Mode.
5. Log in if prompted and see if the Mac reaches the desktop.

Intel‑based Macs

1. Shut down the Mac completely.
2. Press the power button, then immediately hold the Shift key.
3. Release Shift when you see the login window.
4. Log in and check if the Mac boots successfully in Safe Mode.

If Safe Mode works, the issue is often related to third‑party software, login items, or extensions.

Step 4 – Use macOS Recovery

macOS Recovery lets you repair the disk, reinstall macOS, or restore from a backup.

Enter macOS Recovery

Apple silicon

1. Shut down the Mac.
2. Press and hold the power button until “Loading startup options” appears.
3. Select Options, then click Continue.

Intel‑based Macs

1. Shut down the Mac.
2. Press the power button, then immediately hold Command (⌘) + R.
3. Release the keys when you see the Apple logo or a spinning globe.

Once in Recovery

1. Choose your language if prompted.
2. In the macOS Utilities window, you’ll typically see:
   • Restore from Time Machine Backup
   • Reinstall macOS
   • Disk Utility
   • Safari or Get Help Online (on some versions)

Step 5 – Check the disk with Disk Utility

If the startup disk is damaged, macOS may fail to boot. Disk Utility can often repair minor issues.

1. In macOS Recovery, select Disk Utility and click Continue.
2. In the sidebar, select your startup volume (for example, “Macintosh HD”).
3. Click First Aid, then click Run or Continue.
4. Wait for the check to complete and review the result:
   • No errors: Try restarting the Mac normally.
   • Errors repaired: Restart and see if macOS now boots.
   • Cannot repair: You may need to erase the disk and reinstall macOS.

Step 6 – Reinstall macOS (without erasing first)

Reinstalling macOS over your existing installation can fix system files while keeping your data, apps, and settings intact in many cases.

1. In macOS Recovery, choose Reinstall macOS and click Continue.
2. Follow the on‑screen instructions and select your startup disk.
3. Let the installation complete. Your Mac may restart several times.
4. After installation, check if the Mac now boots normally to the desktop.

Note: This process usually preserves your data, but there is always some risk. If you have a Time Machine backup, keep it handy.

Step 7 – Erase the disk and restore from backup

If the disk is badly corrupted or macOS cannot be repaired, a clean erase may be required.

1. In macOS Recovery, open Disk Utility.
2. Select the top‑level disk (not just the volume) in the sidebar.
3. Click Erase.
4. Choose a format (typically APFS for newer Macs, Mac OS Extended (Journaled) for older ones) and give it a name.
5. Click Erase and wait for the process to finish.
6. Quit Disk Utility and choose Reinstall macOS.
7. After installation, use Migration Assistant or Restore from Time Machine to bring your data back, if you have a backup.

Warning: Erasing the disk permanently deletes all data on that drive.

Internet Recovery and missing startup disk

If you see a spinning globe or a folder with a question mark, your Mac can’t find a valid startup system.

• Spinning globe: The Mac is trying to start from Internet Recovery. Follow the prompts to load Recovery, then use Disk Utility or Reinstall macOS.
• Question mark folder: The startup disk is missing, erased, or not set. Use Recovery to:
  • Check the disk in Disk Utility.
  • Reinstall macOS on the internal drive.
  • Set the correct startup disk in Startup Disk (if available).

When it might be hardware

If none of the software steps work, the problem may be physical hardware.

• No response at all: Even with a known‑good charger and outlet, the Mac stays completely dead.
• Frequent sudden shutdowns: The Mac powers off randomly, even in Recovery.
• Unusual noises: Clicking, grinding, or repeated fan surges.
• Visible damage: Liquid spill, cracked case, or impact damage.

In these cases, professional service is usually required.