Power Adapter Note

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.

The computer will not power on (no blower movement, hard drive spin up and display is not lit)

  1. Remove any connected peripherals and eject any PC card.
  2. Check that the battery has enough charge to start the computer by pressing the button next to the LEDs on the battery. At least one LED must light solid (not flashing).
  3. Connect a known-good Apple 65W Portable Power Adapter (661-3048) and power cord or plug to a known-good power outlet; make sure the DC plug is firmly inserted. The DC plug should light up, if not, replace Sound/DC-in board.

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.

  1. Try powering up without the battery installed (only works with 65W power adapter). If it boots, replace battery connector cable.
  2. Perform the keyboard PMU reset procedure described in the Troubleshooting Aid section.

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).

  1. Press Caps Lock key to see if key light comes on. If it does, hold power button down for six seconds to shut down the computer and restart.
  2. If it still doesn't start, verify power button cable is connected properly to top case flex cable assembly and that the flex cable is connected correctly to the logic board, if power button is not functioning correctly or damaged, replace the top case.
  3. Disconnect keyboard completely. Inspect connectors. Restart with keyboard disconnected.
  4. Remove any additional RAM.
  5. Remove AirPort Extreme Card.
  6. Verify Sound/DC-in board cable is securely connected.
  7. Try disconnecting the AirPort Extreme flex connector from the logic board and start the computer. If it starts, shut it down and check the flex cable connector and the connector on the logic board and replace the damaged parts.
  8. Repeat step 12 with the following flex cables one at a time, reconnecting each before proceeding to the next cable:
  • Sound/DC-in flex cable
  • Hard drive flex cable
  • Optical drive flex cable
  • PC card cage flex cable
  • Keyboard flex cable
  • Trackpad flex cable
  • Right USB flex cable
  • Modem flex cable

If the computer starts up, inspect the flex cable connector and its connector on the logic board for damage and replace the damaged parts.

  1. Try known-good Sound/DC-in board.
  2. Replace logic board.

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