USB and FireWireTroubleshooting
PowerBook (FireWire)
19
USB and FireWire
After you connect external USB or FireWire device,
computer does not boot
1. Disconnect all external devices and boot 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 boots 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 booted, 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 booted with the “T” key held down.
5. Check the keyboard connection.
6. Replace keyboard.
7. Replace I/O logic board.
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