Technical information

Symptom Charts / Power -
8
Troubleshooting
PowerBook (FireWire)
Screen is blank;
backlight isn’t on;
computer doesn’t
respond
1. Restart the computer by pressing the reset button on the back
of the unit. Wait five seconds and press the Power key.
2. Restart computer.
3. Disconnect power adapter and remove battery, then wait 3-4
minutes. Reconnect computer to power source and restart.
4. Check power adapter cable.
5. Try known-good, charged battery.
6. Try known-good power adapter.
7. Remove all power (power adapter and batteries) and
disconnect backup battery for ten minutes.
8. Check all I/O logic board cables and connections.
9. Replace sound card.
10. Replace microprocessor board.
11. Replace power supply card.
12. Replace I/O logic board.
Power adapter is
plugged in, but
Control Strip doesn’t
indicate adapter is
connected
1. Verify power adapter is connected correctly and the power
cord is plugged solidly in the adapter.
2. Verify there is power at the outlet.
3. Try known-good power adapter.
4. Try known-good power cord.
5. Reset power manager (press reset button behind the I/O door.
6. Replace sound card.
7. Replace power supply card.
8. Replace I/O logic board.
After you remove
battery and power
adapter, some Control
Panel settings are
different
1. Connect power adapter to unit for 24 hours to see if backup
battery is just depleted. (It takes approximately 48 hours to
fully charge the backup battery.)
2. Check backup battery cable and connections.
3. Replace backup battery.
4. Replace I/O logic board.