Apple M9628LL Service Guide - Page 152

Sound, A USB device not recognized by computer, Distorted sound from speakers

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8. Try a different cable. 9. If self powered make sure that the power supply is connected and device's LED indicates that it is getting power. 10. Replace logic board. A USB device not recognized by computer Note: If you are trying to use a serial device with a USB/Serial adapter, check with the manufacturer of the adapter for compatibility. 1. Completely shut down, then press the power button to start the computer. 2. Try known-good Apple USB keyboard or mouse to verify the port is working properly. 3. Verify current driver for the device is installed. 4. If a camera, turn on camera after initiating download with camera application. 5. Try the other USB port. 6. Try different USB device on same port. 7. Eliminate chain by plugging in only one peripheral. 8. Replace logic board. Sound Distorted sound from speakers 1. Verify sound is correct with external speakers/headphones. If sound is correct, replace top case. 2. In Mac OS X check balance. 3. Compare same sound with two different units to make sure that sound is actually distorted. 4. Replace top case. No sound from speaker(s) 1. Use the Software Update control panel to verify that the latest audio update has been installed. 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. Shutdown computer and restart. 6 - iBook G4 (14.1 LCD) Troubleshooting Symptom Charts

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6 -
iBook G4 (14.1 LCD) Troubleshooting
Symptom Charts
8.
Try a different cable.
9.
If self powered make sure that the power supply is connected and device's LED
indicates that it is getting power.
10.
Replace logic board.
A USB device not recognized by computer
Note:
If you are trying to use a serial device with a USB/Serial adapter, check with the
manufacturer of the adapter for compatibility.
1.
Completely shut down, then press the power button to start the computer.
2.
Try known-good Apple USB keyboard or mouse to verify the port is working properly.
3.
Verify current driver for the device is installed.
4.
If a camera, turn on camera after initiating download with camera application.
5.
Try the other USB port.
6.
Try different USB device on same port.
7.
Eliminate chain by plugging in only one peripheral.
8.
Replace logic board.
Sound
Distorted sound from speakers
1.
Verify sound is correct with external speakers/headphones. If sound is correct, replace
top case.
2.
In Mac OS X check balance.
3.
Compare same sound with two different units to make sure that sound is actually
distorted.
4.
Replace top case.
No sound from speaker(s)
1.
Use the Software Update control panel to verify that the latest audio update has been
installed.
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.
Shutdown computer and restart.