Thanks for all the suggestions. It does seem like a Kernal Panic. It happens so rarely that I don't think that I will try to fix it unless the Kernal Panic is an affliction that will increase in severity. Is It??? I have not added anything to the computer for 6 or 7 months and it was only by accidentally striking several keys at once that the KP appeared. I have since limited my keyboard attacks to one key and one finger only when I wish to shift from the screen saver to the desktop. The G4's bad sleeping habits probably are related to the Sonnet CPU which was installed about a year ago.