Mac startup keys

This page used to provide a list of Mac start-up keys - keys which, when pressed at various points in the Mac start-up sequence, resulted in special actions. A more complete list has been created by Dave Polaschek:

Magical Macintosh Key Sequences

Its title isn't quite accurate, because his document also covers some key sequences acted upon in normal operation (after start-up).

You may wish to access my obsolete document.