b. The startup cursor freeze

Several readers have asked for more information on the mouse-related startup cursor freeze. First, let me clarify: there are many causes for startup freezes and most have nothing to do with the mouse. If you have the specific symptom described last time, check with Apple (calling SOS-APPL would be a good start) or take your system to an authorized Apple Service Provider. They will be able to diagnose if you have the critical symptoms that indicate mouse involvement (I could be a bit more specific myself, but I have gotten in trouble with Apple's legal department twice already for doing this).