The system was designed to use the Apple 65-Watt Portable Power Adapter that came with your computer. The previous 45-Watt Apple power adapter for PowerBooks is plug compatible, but it may not provide sufficient power during some activities and power may be drawn temporarily from the battery. You can identify the Apple 65W Power Adapter by its markings (see photo).
Under low battery or no battery situations, the 45 watt power adapter may not be able to provide enough power to properly support the system.
Although you may have used the 45 watt adapter with a PowerBook G4 (1GHz/867MHz) without trouble, the peak power requirements of the PowerBook G4 (15-inch FW 800) is much higher and will have a higher chance of encountering compatibility issues.
Important: The Apple 65W Portable Power Adapter is highly recommended to be used with the PowerBook G4 (15-inch FW 800) computer. The adapters can be identified by 65W in the name and markings, and the metal securing-stud on the plug connector. Although previous 45W power adapters (see Knowledge Base article 88231 PowerBook and iBook: Apple Power Adapter) are plug compatible with the PowerBook G4 (15-inch FW 800), it may not provide sufficient power during some activities and power may be drawn temporarily from the battery.
Warning: Resetting the power manager will permanently remove a RAM disk, if present, and all of its contents. You will also need to reset the date and time (using the Date & Time system preference pane).
If the computer starts up, inspect the flex cable connector and its connector on the logic board for damage and replace the damaged parts.
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