When Norton DiskLight is installed and the "Preserve Memory Contents On Sleep" feature is enabled in the Energy Saver control panel, a PowerBook (FireWire) or iBook computer may crash when going to sleep. To avoid this, either disable the Norton DiskLight extension or deselect "Preserve Memory Contents On Sleep" in the Advance Settings part of the Energy Saver control panel.
Note: For compatibility reasons, the Preserve Memory Contents on Sleep feature has been removed in Mac OS 9 versions 9.0.4 and later. You may still see the option in the Energy Saver control panel but it will be dimmed.