Exploring the inner-workings of a computer can be fun. After using Mac OS X for many years, it's really easy to know how the system is organized. In this video, Hildron101010, and Cugocat12, experiment with some ways to make a Mac not able to start up. This is done by using the Finder to change permissions on key system folders and files, and by using the Terminal, or a single-user session, to delete critical folders or files in OS X. http://www.thecomputerclan.com/