Your Mac suddenly cannot turn ON, start or boot up after installing macOS Monterey.
Why did this happen?
- Your Mac might have ran out of battery or have power connection issues.
- Some connected devices might have interfered with the startup.
- Some settings may have changed during the upgrade.
What should I do next?
- Check your Mac power connections
Press the Power button and see if you can hear a startup chime, or fan noises which normally indicates the boot up.
If none of these happened, try doing these:
- Check the power adapter if it is properly plugged in.
- Check if the charger or power cable is properly working.
- Try to connect to a different power outlet.
- If you are using a MacBook, charge it for about an hour to make sure that the battery is not empty.
If you can hear a startup chime but it still won't boot up, try Power Cycle:
- For MacBook:
Press the Power button and hold it down for ten (10) seconds. Restart your Mac. - For iMac/Mac Mini:
Unplug the power cable, then plug it back in after ten (10) seconds. Restart your Mac.
- Remove all connected devices
-
Sometimes, external accessories connected to your Mac may interfere with its startup.
Unplug all connected devices, then restart your Mac to see if it is related to the issue.
- Reset SMC
-
Resetting the System Management Controller or SMC fixes power, battery, fan and other hardware-related issues. Doing this will not remove any data you saved on your Mac.
- Reset NVRAM/PRAM
NVRAM, or non-volatile random access memory, is a small amount of memory your Mac uses to store settings so the Mac can access them quickly. PRAM, or Parameter RAM, stores similar information.
Resetting NVRAM/PRAM sometimes solves boot up issues when you just updated your Mac. Doing this will not remove any data you saved on your Mac.
- Reboot your Mac in Safe Mode
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- Go to Apple menu > Shut down.
- Turn ON your Mac while pressing down the SHIFT key.
- Release the SHIFT key when you see the login window.
- Boot up using macOS Recovery Mode
If your Mac still not booting up after the macOS update, there is a chance that your system could be damaged, broken, or your hard drive is corrupted.
Use First Aid in Disk Utility to resolve this issue.
- If it says your disk appears to be OK or has been repaired, your issue is now resolved.
- If it has an overlapped extent allocation error, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. Check if you can replace or recreate the affected files. If that is not possible, try to open the file to check its contents and see if you can delete it.
- If it cannot repair your disk , or you see a report that the First Aid process failed , try to repair the disk or partition again.
If that still doesn’t work, back up as much of your data as possible, reformat your disk, reinstall the macOS, then restore your backed-up data.
- Contact Apple Support
If you exhausted all the solutions above and still encounter the issue, your Mac may be physically damaged or it needs to be repaired:
