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

So, if you're using a Windows keyboard, restart your Mac and hold down the Windows key+R combination to boot into Recovery Mode. Alternatively, use a Terminal command.

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 ...