Issue Description
The progress bar stalls, the Apple logo freezes, or the Mac never reaches the login screen.
Common Causes
- Corrupt startup items
- Faulty peripherals
- File system errors
Step-by-Step Solution
Step 1: Disconnect All External Devices
- Remove USB drives, hubs, monitors, printers
- Restart Mac
Step 2: Boot into Safe Mode
- Follow Safe Mode steps above
- If boot succeeds, issue is likely third-party software
Step 3: Check Disk Health
- Restart into Recovery
- Open Disk Utility → First Aid
Step 4: Reset Startup Settings
- Remove unnecessary Login Items
- Restart normally
Explore Further
- Check Console logs for startup errors
Prevention & Best Practices
Avoid force-shutting down during updates.