User Guide

12 - PowerBook G4 (12-inch) Troubleshooting
Symptom Charts
Misc. Symptoms
The computer runs with battery, but not with the power adapter plugged into
wall outlet
1. Try known-good power outlet.
2. Try known-good power adapter and power cord.
Note: Verify that power adapter connector glows amber or green. If the power
adapter light is green, turn over the computer and press the battery button. One to
five lights glow to show the battery’s level of charge. One blinking light indicates that
the battery does not have sufficient charge to turn on.
Reset the power manager by pressing the key combination Control-Option-Shift-
power.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
3. Replace DC-in board
4. Replace DC-to-DC board.
5. Replace logic board.
The computer runs when plugged into a wall outlet but not on battery power
1. Reseat battery to verify battery is seated correctly with battery lock engaged.
2. Try known-good charged battery.
3. Reset the power manager by pressing the key combination Control-Option-Shift-
power.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
4. Replace DC-to-DC board.
5. Replace logic board.