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PowerBook G4 (17-inch) Troubleshooting - 27
Hardware Symptom Charts
Keyboard
No response from any key on keyboard
1. Remove any connected peripherals and eject any PC card.
2. Attach an external USB keyboard, if it doesn’t work, go to step 7.
3. Turn off the computer. Check the top case flex cable connection to the logic board
(under the lower RAM, if installed).
4. Inspect the top case and keyboard flex cable connectors and cables. If the top case
flex cable looks bad, replace top case.
5. Start up from the software install and restore disc that came with the computer (hold
down the "C" key during restart, if possible) to verify that it is not a software problem.
6. Replace keyboard.
7. Replace logic board.
No keyboard illumination
1. Go to Keyboard system preference pane and make sure the “Illuminate keyboard in
low light conditions” check box is checked. Try using system in a dimly lit environment.
Note: The keyboard illumination is not bright enough to be seen in most well lit spaces. In
order to view the key being illuminated, the ambient light needs to be dim.