MacBook Pro 2011 with fuzzy screen won’t boot

Safe Mode working means that it is likely that something you installed is preventing the OS from booting. Specifically programs you have added to start at login in your user account or other things you may have installed that adds kexts to the system.

1. Look in System Preferences > Users &Groups > Login Items

Remove them all and reboot. If it boots one of them is the problem, add them back till you find which one it was.

2. Look in /Library/StartupItems

Drag everything out of there (desktop or a folder somewhere) and reboot. As above if it boots fine one of those was the problem.

It is also possible that something went wrong with the OS and something OS related was damaged. you could try applying the latest combo updater for your current OS to see if that helps.

If nothing there helps, either I missed a location for startup items or you may need to reinstall the base OS. But before you do that, boot in safe mode and backup your drive.

How about start in safe mode?

Try safe mode if your Mac doesn‘t finish starting up

Follow these steps to start up into safe mode:

1. Start or restart your Mac.
2. Immediately after you hear the startup sound, press and hold the Shift key.
3. Release the Shift key when you see the Apple logo appear on the screen.