This article discusses compatibility between both the PowerBook (FireWire) and iBook computers and a third-party utility, Norton DiskLight.

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.