Apple PowerBook - Power and Display Issues

Power
PowerBook (FireWire)
8
Troubleshooting
Power
Computer won’t power up
1. Restart computer by pressing the reset button on the
back of the unit. Wait five seconds and press the power
on key.
2. Try known-good power adapter.
3. Try known-good, firmly seated, charged battery. Repeat.
4. Connect power adapter and restart computer in 3–4
minutes.
5. Disconnect internal keyboard completely and try
powering up unit. If unit powers up, replace keyboard.
6. Verify that microprocessor card is firmly seated.
7. Replace sound card.
8. Replace power supply card.
9. Replace microprocessor board.
10. Replace I/O logic board.
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
on 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.