Technical information

Symptom Charts / USB and FireWire -

Troubleshooting

PowerBook (FireWire)

Cursor moves on

screen with external

mouse connected, but

clicking or double-

clicking the mouse

has no effect

1. If the mouse is connected to an external keyboard, connect the

mouse to one of the USB ports on the computer.

2. Try the other USB port.

3. Try another mouse.

4. Reset PRAM.

5. Start up from the CD that came with the computer. If the

mouse works, reinstall the system software.

6. Replace I/O logic board.

Cursor moves, but

clicking trackpad

button has no effect

1. Reset power manager (press the reset button behind the I/O

door).

2. Remove top case and manually press trackpad button on power

supply with a nylon tool or other non-metal object. If button

activates cursor, check top case seating.

3. Replace power supply card.

4. Replace trackpad button actuator (included in the top case).

Cursor does not move

on the screen with an

external mouse, but

USB external

keyboard works

1. Verify the mouse is connected securely to the USB keyboard or

port.

2. Check inside mouse for buildup of dirt or other contaminants.

Clean mouse if necessary.

3. If mouse is connected to the keyboard, connect it to a USB port.

4. Try the other USB port.

5. Try another mouse.

6. Replace I/O logic board.