Safe mode is a powerful tool for troubleshooting driver issues or software issues. Here is how to start any Mac in safe mode.

Booting in safe mode to resolve login issues Several users with login problems (usually startup getting stuck at the login screen) after applying the Mac OS X 10.3.4 update report that starting up ...

If the same issue occurs (and you see it can only boot in safe mode), you know it's hardware. There's a possibility, for example, that safe mode is disabling certain graphical drivers that are ...