Specifications

Troubleshooting Symptom Charts/Startup - 6
2 Press the F3 key (with the fn key pressed and not pressed) to
verify that mute mode is not enabled.
3 Press the F4 or F5 key (with the fn key pressed and not
pressed) to check the volume setting.
4 Verify no external speakers or headphones are plugged in.
5 Check the speakers tab on the Sound control panel to confirm
that the software is correctly seeing that there are no
external speakers or headphones connected.
6 Shutdown computer and restart.
7 Reset PRAM (Press the power button, then hold down the
Option-Command-P-R keys until you hear the startup chime
at least one additional time after the initial startup chime).
8 Verify that the speaker cable is connected properly to logic
board.
9 Replace top case.
10 Replace logic board
Related article:
58463: iBook: Sound Capabilities
Startup
The computer will not
power on
1 Remove any connected peripherals.
2 Try known-good power outlet.
3 Try known-good power adapter and power cord.
4 Remove battery.
5 Press Caps Lock key to see if light on key comes on. If it does,
hold power button down for six seconds to shut down the
computer and restart.
6 Reset the power manager by pressing the reset button
(located above and right of the Audio/Video port). Wait five
seconds before continuing. Press the power button to start the
computer.
Note: Make sure the reset button is not caught under the button
opening.
Warning: Resetting the power manager will permanently
remove a RAM disk, if present, and all of its contents. You will
also need to reset the date and time (using the Date & Time
control panel).
7 Disconnect keyboard completely. Inspect connectors. Restart
with keyboard disconnected.
8 Remove any additional RAM
9 Remove AirPort Card.
10 Try known-good DC board.
11 Verify power button is connected properly to logic board, if