Issue Description
After a macOS update, the Mac may fail to boot, restart repeatedly, or stay stuck at the Apple logo.
Common Causes
- Interrupted update process
- Incompatible third-party extensions
- Corrupt system files
- Low disk space during update
Step-by-Step Solution
Step 1: Force Restart the Mac
- Hold the Power button until the Mac shuts down
- Wait 10 seconds, then power it back on
Step 2: Boot into Safe Mode
Apple Silicon Macs:
- Shut down
- Hold Power until Startup Options appear
- Select startup disk → hold Shift → click Continue in Safe Mode
Intel Macs:
- Power on and immediately hold Shift
- Release when login screen appears
Step 3: Run Disk Utility First Aid
- In Safe Mode or Recovery:
- Open Disk Utility
- Select Macintosh HD
- Click First Aid
Step 4: Reinstall macOS (Without Data Loss)
- Restart into macOS Recovery
- Select Reinstall macOS
- Follow on-screen instructions
✔ This does not erase data
Explore Further
- Remove incompatible login items
- Update third-party drivers after boot
Prevention & Best Practices
Ensure 30–40 GB free space before updates.