Technical information

Symptom Charts / USB and FireWire -
17
Troubleshooting
PowerBook (FireWire)
USB and FireWire
After you connect
external USB or
FireWire device,
computer does not
start up
1. Disconnect all external devices and start up computer. Then
plug in devices.
2. Eliminate chain by plugging in only one device.
3. Try
another
port.
4.
Start up system with extensions off.
5. If device is self-powered, power on external device before
starting computer.
6. Check cable connections.
7. Try known-good cable.
8. Try known-good external device.
9. Replace I/O logic board.
Computer starts up to
a floating FireWire
icon (similar to SCSI
Disk Mode)
1. Reset computer.
2. Replace keyboard.
3. Replace I/O logic board.
In target disk mode,
computer does not
display FireWire icon
until host is started
up, or computer
crashes when host is
shut down
1. Verify
FireWire
cable is good and check the connection.
2. Make sure host computer is running FireWire 2.3 or later. Use Apple
System Profiler to verify.
3. Make sure no other FireWire devices are connected.
4. Verify computer was started up with the T key pressed.
5. Check the keyboard connection.
6. Replace keyboard.
7. Replace I/O logic board.