Apple macbook pro User Manual

MacBook Pro Troubleshooting — Hardware Symptom Charts 201
Audio Quality Poor
The camera is recognized but the built-in microphone’s audio quality is poor.Open the System Preferences window and click on Sound.  
1.  
- Verify that the internal microphone has been selected as the sound input port.  
- Verify that the input volume settings are appropriate. Use the volume level meter to verify 
settings.
Open iMovie and create a new project. Click on the Audio button and record a sound 
2.  
sample. If audio...

MacBook Pro Troubleshooting — Hardware Symptom Charts 202
Keyboard is partially illuminated. 
Check the keyboard backlight cable connection to the top case flex if bad replace the top 
1.  
case.
Replace keyboard.
2.  
Microphone
The microphone is not working
Check the Sound system preference pane and verify the selection under the Input tab is for 
1.  
the built-in microphone.
Check the signal level and level meter and adjust the gain.
2.  
Reset PRAM (Press the power button, then hold down the...

MacBook Pro Troubleshooting — Hardware Symptom Charts 203
Open Apple System Profiler, and under the Hardware tab look at USB . It should show the 
7.  
modem presence by indicating Apple External Modem.. If not visible, start checking modem 
USB connection.
Replace the external modem.
8.  
Replace logic board.
9. 
Modem does not respond (can hear dial tone)
Check that the correct modem is selected in the Network Port Configuration section of the 
1.  
Network system preferences.
Check modem application...

MacBook Pro Troubleshooting — Hardware Symptom Charts 204
Optical Drive
Optical Drive not recognized
Make sure the optical drive is a cable select drive set as a slave (1). 
1.  
Make sure the optical drive flex cable is undamaged and properly installed. If bad, replace.
2.  
Replace optical drive.
3. 
The optical drive does not accept CD or DVD disc (mechanical failure)
Verify disc is not warped and is a 12 cm circular disc.
1.  
Check that a small disc is not stuck inside, or other foreign objects....

MacBook Pro Troubleshooting — Hardware Symptom Charts 205
Difficulty writing to optical media
Verify the correct type of disc is being used.
1.  
Try a different brand or speed of CD-R disc.  
2.  
Note: Some brands of 24x or 32x CD-R media may not work with the SuperDrive.  
Note: There are two factors in the ability for the optical drive to write to media.  
- First, there are varying qualities of blank optical media. Some media are made to such low 
specifications that the ability for the drive to...

MacBook Pro Troubleshooting — Hardware Symptom Charts 206
Try different USB device on same port.
5. 
Eliminate chain by plugging in only one peripheral.
6.  
Try known-good Apple USB keyboard or mouse to verify the port is working properly. If the 
7.  
left port is bad, check the Left I/O board flex cable and connections. If the right port is bad, 
check the backup battery flex cable and connections.
If the Left I/O flex cable is fine, replace the Left I/O board for the left USB port.
8.  
Replace logic...

MacBook Pro Troubleshooting — Hardware Symptom Charts 207
Power Adapter 
The power adapter LED does not turn on
Confirm the power adapter is connected to a known good outlet.
1.  
Try replacing the AC plug or the AC power cord. If the adapter works replace the appropriate 
2.  
plug or cord.
Check the pins in the power adapter DC plug for pins stuck down.  
3. 
 
If pins are stuck down, try cleaning the contact 
 
Debris removal should be done with a soft, non-electrostatic generating (non-plastic...

MacBook Pro Troubleshooting — Hardware Symptom Charts 208
Check if pins are missing or bent. Replace the power adapter
5. 
Check the power port on the computer for contamination which prevents the pins to make 
6.  
contact. It can be cleaned with a soft brush. Do not use liquid.  
In addition, foreign material may be pulled in which covers the contacts or prevents the DC 
plug to seat enough for the sense pin to connect to the system. 
Remove the battery and connect the power adapter. If the adapter...

MacBook Pro Troubleshooting — Hardware Symptom Charts 209
No sound from speaker(s)
Use the Software Update system preference pane to verify that the latest audio update has 
1.  
been installed.
Press the F3 key (with the fn key pressed and not pressed) to verify that mute mode is not 
2.  
enabled.
Press the F4 or F5 key (with the fn key pressed and not pressed) to check the volume setting. 
3. 
Verify no external speakers or headphones are plugged in.
4.  
Check the speakers tab on the Sound control...

MacBook Pro Troubleshooting — Hardware Symptom Charts 210
Trackpad
The cursor does not move when you are using trackpad
Verify that no USB device is connected.
1.  
Boot from the Software Install and Restore DVD to verify that it is not a software problem. If 
2.  
the trackpad works, restore the system software.
Reset the power manager. See new procedures under the “Resetting the Power Manager Unit 
3. 
(SMC)” heading in the Hardware Troubleshooting Tools and Tips section.
Check trackpad flex cable...