Troubleshooting

PowerBook G4 (12-inch 1.5 GHz)

Symptom Charts

How to Use the Symptom Charts

The Symptom Charts included in this chapter will help you diagnose specific symptoms related to the product.

The steps to solve a symptom are listed sequentially. You might not need to perform every step before the symptom is solved. Start with the first step, and then test for the symptom. If the symptom persists, replace any modules you removed, go to the next step, and test again. Continue down the list until the symptom is solved.

Important: This computer starts up only in Mac OS X. Mac OS 9 is not available as a startup disk and previous versions of the Mac OS should not be installed on this computer.

AirPort Extreme Card not recognized

  1. Use Software Update in Mac OS X system preferences or see the Apple Software Updates web page to make sure the latest version of AirPort software is installed.
  2. Reseat AirPort Extreme Card and make sure AirPort antenna cable is fully connected.
  3. Verify settings in Network Preferences pane.
  4. Check that AirPort Extreme Card appears in Apple System Profiler under Network overview in System Profile.
  5. Replace with known-good AirPort Card.
  6. Replace logic board.

AirPort communication erratic

  1. Use Software Update in Mac OS X system preferences or see the Apple Software Updates web page to make sure the latest version of AirPort software is installed.
  2. Make sure the computer is within antenna range of the other computer or the network's access point.

Note: Nearby electronic devices or metal structures can interfere with wireless communication and reduce the antenna range. Repositioning or rotating the computer may improve reception.

  1. Check the signal strength shown in the AirPort status icon in the menu bar. Up to four bars can appear.
  2. If the symptom remains, refer to the Knowledge Base for the latest articles on computer placement and how to optimize AirPort performance.

Poor AirPort reception

  1. Refer to Knowledge Base article 88258: PowerBook G4: How to Optimize AirPort reception.
  2. Reseat AirPort antenna and cable.
  3. Check AirPort antenna cable for damage.
  4. Replace with known-good AirPort Extreme Card.
  5. Replace AirPort antenna board and cable.

Battery won't charge

  1. Make sure that power adapter connector is fully inserted.
  2. Remove any connected peripherals.
  3. Try known-good power outlet. Green or amber light should glow at power adapter connector.
  4. Try known-good power adapter and power cord.

Note: Verify that power adapter connector glows amber or green. If the power adapter light is green, turn over the computer and press the battery button. One to five lights glow to show the battery's level of charge. One blinking light indicates that the battery does not have sufficient charge to turn on.

  1. Remove battery and reseat it.
  2. Try known-good battery.
  3. Reset the power manager by pressing the key combination Control-Option-Shift-power.

Warning: Make sure you do not hold down the "fn" key when resetting the power manager.

Warning: Resetting the power manager means you will also need to reset the date and time (using the Date & Time control panel).

  1. Update to Mac OS 10.2.4 or later, or boot from external device with 10.2.4.
  2. Replace DC-to-DC board.
  3. Replace logic board.

Battery won't charge completely

  1. If battery reaches 96 percent and doesn't charge further, this is normal operation. Refer to Knowledge Base article 88344: PowerBook G4, iBook: Battery Does Not Show Full Charge in Mac OS X.
  2. If battery charges to 95 percent or less and stops charging before reaching 100 percent, replace DC-to-DC board.

Short battery life

Refer to Knowledge Base article 114154: SOP: Battery Screening Process--Worldwide.

  1. Make sure that power adapter connector is fully inserted.
  2. Try known-good power outlet.
  3. Try known-good power adapter and power cord.

Refer to Knowledge Base article 50666: Tips for maximizing your PowerBook and iBook battery charge

  1. Remove all third-party devices (printers, hubs, third-party keyboard, or mice), and test the computer.
  2. Reset the Power Manager.
  3. Calibrate the battery.

Related articles:

86440: PowerBook, iBook Life

86284: Calibrating your computer's battery for best performance

Battery does not charge; shows an "X" in the menu bar icon; or status light on battery case does not go out

1. Calibrate the battery.

Refer to Knowledge Base article 86284: Calibrating your computer's battery for best performance

2. Test the battery under a normal workload. If the battery lasts less than two hours, it is considered to have severely degraded performance.

  • If the battery was purchased (either with the computer or as a standalone part) in the last 90 days and exhibits severely degraded performance (as defined above) provide an in-warranty replacement.
  • If the battery was purchased between last 90-365 days, have the customer calibrate their battery. If after recalibration the battery still exhibits severely degraded performance, then provide an in-warranty replacement.
  • If the battery was purchased more than 365 days ago, the customer needs to purchase a new battery.

Bluetooth not recognized when ADC monitor connected

  1. Disconnect all devices except the monitor.
  2. Restart the computer.
  3. If Bluetooth is still not recognized, refer to Bluetooth topic articles in the Knowledge Base for the latest information on optimizing Bluetooth performance.

The computer automatically performs a power-on self test when it is turned on after being fully shut down (not a restart). This section describes what to do if beeps are heard during the startup.

Note: The computer has a memory expansion slot that accepts a 1.25-inch (or shorter) PC-2100 compliant, SO-DIMM memory card. Refer to the Memory Replacement instructions for removal and installation.

Computer beeps once at startup

  1. One beep means that no RAM is detected.
  2. If a RAM card is installed in the expansion slot, remove it and put in known-good and compatible RAM and restart.
  • If symptom does NOT repeat, replace RAM card.
  • If symptom repeats, replace logic board.

3. If no RAM card is installed, replace logic board.

Computer beeps three times at startup

  1. Three beeps means that no RAM banks passed memory testing.
  2. If a RAM card is installed in the expansion slot, remove it and put in known-good and compatible RAM and restart.
  • If symptom does NOT repeat, replace RAM card.
  • If symptom repeats, replace logic board.
  1. If no RAM card is installed, replace logic board. Computer beeps four times at startup
  2. Four beeps indicates a bad checksum for the remainder of the boot ROM. The ROM (which is located on the logic board) is bad.
  3. If a RAM card is installed in the expansion slot, remove it and put in known-good and compatible RAM and restart.
  • If symptom does NOT repeat, replace RAM card.
  • If symptom repeats, replace logic board.

3. If no RAM card is installed, replace logic board.

Related article:

58442: Power On Self-Test Beep Definition - Part 2

Hard drive will not initialize

  1. Boot from Software and Restore DVD. Under the File menu, select Disk Utility, and see if the hard drive appears on the list.
  2. If no hard drive is found in Disk Utility, verify the hard drive cable connections.
  3. Replace hard drive cable.
  4. Replace hard drive.

Important: If the computer is under warranty and data recovery is required, refer to Article 31077: Hard Drive Data Recovery & Warranty Implications, for important information.

5. Replace logic board.

The internal hard drive does not spin

  1. Disconnect any connected peripherals.
  2. Try known-good power outlet.
  3. Try known-good power adapter and power cord.
  4. Boot from Software and Restore DVD.
  5. Verify Disk Utility does not recognize the hard drive.
  6. Verify cable connections.
  7. Reset the power manager by pressing the key combination Control-Option-Shift-power.

Warning: Make sure you do not hold down the "fn" key when resetting the power manager.

Warning: Resetting the power manager means you will also need to reset the date and time (using the Date & Time control panel).

  1. Replace hard drive cable.
  2. Replace hard drive.

Noisy hard drive

Some sounds such as ticking or a rotational noise are normal. Refer to Knowledge Base article 30593: PowerBook: Hard Drives and Noise.

No response from any key on keyboard

  1. Remove any connected peripherals.
  2. Boot from Software and Restore DVD to verify that it is not a software problem.
  3. Turn off the computer. Disconnect the keyboard connector and inspect connectors.
  4. Replace keyboard.
  5. Replace logic board.

Keycap pops off

  1. If the keycap is not broken, it can probably be reinstalled. To replace the keycap, refer to Knowledge Base article 88106: PowerBook G4: Keycap Replacement.
  2. Replace keyboard.

No modem dial tone

  1. Check that the correct modem is selected in the Network Preferences pane. In Modem tab, check that sound is not turned off.
  2. It is possible that the modem is connecting but not generating a sound. Check Internet Connect to verify status.
  3. Verify known-good analog (not digital) telephone line.
  4. Verify known-good RJ11 telephone cable.
  5. Verify RJ11 cable is not plugged into Ethernet port.
  6. Inspect RJ11 connector and modem port for pin damage.
  7. Verify RJ11 telephone cable is firmly installed in the modem port.
  8. To verify system function, in Modem tab, deselect "Wait for Dial Tone Before Dialing."
  9. Verify modem 2-pin connector is plugged into modem correctly.
  10. Replace the RJ11 modem cable and port.
  11. Replace modem.

Related article:

106592: Mac OS X: How to Use Modem AT Commands

Cannot send fax

  1. Check that Network connection in System Preferences is set to Internal Modem.
  2. Refer to Knowledge Base article 25746: Mac OS X 10.3: Fax doesn't send.

Cannot receive fax

Check that "Receive faxes on this computer" is selected in the Print & Fax area of System Preferences.

Related articles:

25731: Mac OS X 10.3: Receiving faxes and connecting to the Internet 25596: Mac OS X 10.3: About Receiving Faxes.

Modem drops connection

  1. Try known-good phone line.
  2. Refer to Knowledge Base article 106748: Mac OS X: Troubleshooting a dial-up/PPP Internet connection.

The optical drive does not accept CD or DVD disc (mechanical failure)

  1. Verify disc is not warped.
  2. Verify disc is correct size. The computer will accept only 120 mm round disc. Refer to article 58641: Macintosh: Using Nonstandard Discs in CD-ROM or DVD-ROM Drives.
  3. Replace optical drive.

The disc icon does not show up on the desktop, or a dialog box appears to initialize disc

  1. Verify the correct type of disc is being used.
  2. Try cleaning the disc. It may not mount if dirty or scratched.
  3. Try a different disc.
  4. Create new Mac OS X user and log in as that user. (So that the customer does not question the new user, remove the user once disc is verified.)
  5. Reseat optical drive cable.
  6. Replace optical drive cable.
  7. Replace optical drive.

The optical drive does not eject CD or DVD disc

  1. Verify disc is not in use by quitting any applications that may be using the disc.
  2. Press and hold Media Eject key at top right corner of keyboard. If that does not work, hold down Function (fn) key and Media Eject key.
  3. Drag disc icon to trash or select it and press Command-E.
  4. Choose Restart from Apple menu while holding down trackpad button.
  5. Refer to Take Apart to remove the stuck disc and replace the optical drive. Related article:

106752: Macintosh: How to Eject a Disc When Other Options Do Not Work

FireWire or USB port not recognizing devices; or 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. Use Software Update in Mac OS X system preferences to verify that the latest software is installed.
  3. Use Apple System Profiler to verify that the computer is recognizing the device.
  4. For USB, test ports with a known-good Apple keyboard or mouse. Try different USB device on same port.
  5. For FireWire, test by connecting another computer in FireWire Target Disk Mode. Refer to article 58583: How to Use FireWire Target Disk Mode.
  6. If a camera, turn on the camera before opening the video application.
  7. Verify current driver for the device is installed. Verify that drivers are installed properly for third party, if needed.
  8. Create new Mac OS X user and log in as that user. (So that the customer does not question the new user, remove the user once disc is verified.)
  9. Try other port if available.
  10. Try a different cable. (Cable noise could be a problem.)
  11. Try known-good device.
  12. Eliminate chain by plugging in only one peripheral.
  13. If self powered make sure that the power supply is connected and device's LED indicates that it is getting power.
  14. Reset the power manager by pressing key combination Control-Option-Shift-power. Warning: Make sure you do not hold down the "fn" key when resetting the power manager.

Warning: Resetting the power manager means you will also need to reset the date and time (using the Date & Time control panel).

15. Replace logic board.

Distorted sound from speakers

  1. Verify sound is correct with external speakers/headphones. If sound is correct, replace top case.
  2. Verify speaker cables are inserted correctly, and check cables for damage.
  3. Check balance in System Preferences: Sound: Output.
  4. Replace rear panel assembly with attached speakers.
  5. Replace subwoofer.
  6. Replace logic board.

No sound from speaker(s)

  1. Use the Software Update preference pane to verify that the latest software updates have been installed.
  2. Press the F3 key to verify that mute mode is not enabled.
  3. Press the F4 or F5 key to check the volume setting.
  4. Verify no external speakers or headphones are plugged in.
  5. In the Sound preference pane confirm that only one device is listed in the Output tab.
  6. Shut down 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.

The computer will not power on

  1. Make sure that power adapter connector is fully inserted.
  2. Remove any connected peripherals.
  3. Try known-good power outlet.
  4. Try known-good power adapter and power cord.
  5. Remove battery.
  6. 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.
  7. Reset the power manager by pressing the key combination Control-Option-Shift-power.

Warning: Make sure you do not hold down the "fn" key when resetting the power manager.

Warning: Resetting the power manager means you will also need to reset the date and time (using the Date & Time control panel).

  1. 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).
  2. Remove any additional RAM
  3. Remove AirPort Card.
  4. Try known-good DC board.
  5. Verify cable connections and check cables for damage.
  6. Verify power button is connected properly to logic board, if power button is not functioning correctly or damaged, replace the top case.
  7. Replace logic board.

The computer freezes during startup or a flashing question mark appears

1. If using Classic in Mac OS X, check for incompatible extensions:

  • Turn off system extensions in Classic by opening System Preferences, clicking Classic, clicking the Advanced tab, and choosing Turn Off Extensions. Click Restart Classic.
  • If turning off extensions appears to solve the problem, identify and eliminate or reinstall the extension that is causing the problem. Open the Extensions Manager control panel, and turn off the extensions that you suspect are causing the problem. Restart Classic with the extensions turned on again.

2. From the Software Install and Restore disc, use Disc Utility.

The computer shuts down or sleeps unexpectedly

1. Calibrate the battery.

Refer to Knowledge Base article 86284: Calibrating your computer's battery for best performance

2. Test the battery under a normal workload. If the battery lasts less than two hours, it is considered to have severely degraded performance.

  • If the battery was purchased (either with the computer or as a standalone part) in the last 90 days and exhibits severely degraded performance (as defined above) provide an in-warranty replacement.
  • If the battery was purchased between last 90-365 days, have the customer calibrate their battery. If after recalibration the battery still exhibits severely degraded performance, then provide an in-warranty replacement.
  • If the battery was purchased more than 365 days ago, the customer needs to purchase a new battery.

No display, or dim display, but computer appears to operate correctly

  1. Press F2 to increase the screen brightness setting.
  2. Remove any connected devices. Allow the battery to charge to at least 10 percent before plugging in external devices.
  3. Try known-good power outlet, power adapter and power cord.
  4. Reboot the computer—hold down the Control and Command keys and press the Power button, or press and hold the Power button for 5 to 10 seconds to shut down the computer, then press the Power button to restart.
  5. Reset the power manager by pressing Control-Option-Shift-power.

Warning: Make sure you do not hold down the "fn" key when resetting the power manager.

Warning: Resetting the power manager means you will also need to reset the date and time (using the Date & Time control panel).

  1. 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).
  2. Connect an external display, and check for video on external display.
  • If video is fine on external display, replace LCD panel.
  • If video symptom is same on external display, replace logic board.
  1. Verify backlight cable and LVDS cable connections are seated properly and that the cables are not damaged (refer to display assembly replacement instructions).
  2. Replace display assembly.
  3. Verify cable connections and check cables around the hinges for damage.
  4. Replace logic board.

When displaying a single color over the screen area, the LCD panel shows one or more pixels that are not properly lit

Active-matrix LCD technology uses rows and columns of addressable locations (pixels) that render text and images on screen. Each pixel location has three separate subpixels (red, green, and blue) that allow the image to be rendered in full color. Each subpixel has a corresponding transistor responsible for turning the subpixel on or off.

There are typically millions of these subpixels on an LCD display. For example, the LCD panel used in the Apple Cinema HD display is made up of 2.3 million pixels and 6.9 million red, green, and blue subpixels. Occasionally, a transistor does not work perfectly, which may result in the affected subpixel being turned on (bright) or turned off (dark). With the millions of subpixels on a display, it is quite possible to have a low number of faulty transistors on an LCD. Therefore, a certain number of subpixel anomalies is considered acceptable. Rejecting all but perfect LCD panels would significantly increase the retail price for products using LCD displays. These factors apply to all manufacturers using LCD technology—not just Apple products.

To determine whether or not the display has an acceptable number of pixel anomalies, follow the steps below:

  1. Set the display image to one of the following colors: all-white display, all-red display, all-green display, or all-blue display.
  2. Using a jeweler's loupe, pocket microscope, or other magnifying device, identify and count each subpixel anomaly:
  • Bright subpixel anomaly = subpixel that is always on
  • Dark subpixel anomaly = subpixel that is always off

3. Important: Check the number of subpixel anomalies with the following chart:

LCD Size (inches)

Acceptable Number of Subpixel Anomalies

Replace the LCD Panel

Bright

Dark

Combination

Bright

Dark

Combination

12.1 to 15.2

up to 3

up to 5

up to 7

4 or more

6 or more

8 or more

  1. If the number of subpixel anomalies exceeds the acceptable number listed in the chart, replace the LCD panel.
  2. If the number of subpixel anomalies is acceptable, explain to the customer that the pixel anomalies are within specifications, and no repair is necessary.

Important: Do not release the specifications to customers. Instead, inform them that a certain number of subpixel anomalies is considered acceptable, and these factors apply to all manufacturers using LCD technology—not just Apple products.

Video (S-Video and Composite adapter) No video on an external device

  1. Make sure you are using the S-Video and Composite adapter cable.
  2. Verify TV or VCR is set up properly with correct source.
  3. Try different TV or VCR. Check owner's manual for TV or VCR.
  4. Replace adapter cable.
  5. Replace logic board.

The display is rolling (PAL instead of NTSC)

  1. Make sure you are not using Apple's A/V Video Cable.
  2. Make sure you are using the S-Video and Composite adapter cable.
  3. Go to Displays preference pane; change resolution from PAL setting to NTSC setting.
  4. Try a different TV or VCR.
  5. Try a different adapter cable
  6. Replace logic board.

Display shows ghosting (signal reflection)

  1. Verify that cables are correctly installed and firmly seated.
  2. Replace video adapter.

Video (RGB adapter)

No video on an external device

  1. Make sure RGB adapter cable is fully seated.
  2. Click "Detect Displays" button to verify that monitor is being recognized in the Displays preference pane, and is known-good and supported by this computer.
  3. Try known-good RGB adapter.
  4. Replace logic board.
  5. Replace RGB adapter cable.
  6. Replace logic board.

Display shows ghosting (signal reflection)

  1. Verify that cables are correctly installed and firmly seated.
  2. Replace video adapter.

Trackpad works intermittently

The trackpad operation can be affected by hand lotion, humidity, dangling jewelry, and the use of more than one finger on the trackpad.

  1. Check for environmental factors such as humidity, hand lotion, or jewelry.
  2. Clean the trackpad with a clean, dry lint-free cloth.
  3. If the pointer moves as you type because you accidentally brush the trackpad, select "Ignore accidental trackpad input" in the Keyboard & Mouse pane of System Preferences.

Related articles:

17228: Portables: Jumpy or Erratic Trackpad Operation 58389: PowerBook and iBook: Trackpad Does Not Respond

The cursor does not move when you are using trackpad

  1. Verify that no USB device is connected.
  2. Boot from a Mac OS system CD to verify that it is not a software problem.
  3. Reset the power manager by pressing the key combination Control-Option-Shift-power.

Warning: Make sure you do not hold down the "fn" key when resetting the power manager.

Warning: Resetting the power manager means you will also need to reset the date and time (using the Date & Time control panel).

  1. Check trackpad cable and connection to the logic board (see separate Keyboard and Top Case replacement instructions for location under top case).
  2. Replace top case.
  3. Replace logic board.

The cursor intermittently does not move or moves erratically

Note: User must touch with the surface of only one finger at a time and point directly down on the trackpad surface.

  1. Clean trackpad surface (with computer off, using a non-static-inducing material).
  2. Completely shut down, then press the power button to start the computer.
  3. Reset the power manager by pressing the key combination Control-Option-Shift-power.

Warning: Resetting the power manager means you will also need to reset the date and time (using the Date & Time control panel).

  1. 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).
  2. Remove and reseat memory card.
  3. Try unit on battery power. If problem goes away, replace power adapter.
  4. Place a Mac OS system CD in the optical disc drive, press the start button and hold down the "C" key. Check the cursor movement, to see if the problem is software.
  5. Check trackpad cable and connection to the logic board (see separate Keyboard and Top Case replacement instructions for location under top case).
  6. Replace top case.
  7. Reseat the heatsink if it is not properly secured.
  8. Replace logic board.

Tracking is very slow when using Apple Hardware Test.

With the new trackpad design, the trackpad performance is different under Open Firm Ware (the operating environment for Apple Hardware Test). If it is difficult to use the trackpad, use an external wired mouse or keyboard shortcuts, shown below:

Keys

Action

arrow up or arrow down

Pick a language to use

Return or Enter

Select a language to use

Tab

Cycle through the tabs (Hardware Test, Hardware Profile, Apple)

g or Shift-G

Start the Quick Test

e or Shift-E

Start the Extended Test

Shift-R

Restart

Shift-S

Shut down

Command-period

Stop the testing

System Profiler shows Sudden Motion Sensor is "disabled."

Note: In some locations you may see the Sudden Motion Sensor referred to as the Mobile Motion Module. Both names refer to the same feature.

1. Put the computer to sleep. Pick up the computer, and set it on a steady table top. Wake up the computer, and refresh System Profiler window under View menu (or use command-R).

  • If the setting changes to enable, try a few more sleep-wake-refresh sequences to verify the circuit.
  • If the setting is still disabled, launch the Terminal application found in the Utilities folder. Note: You will need the system password. At the command line, enter the command: sudo pmset -a ams 1

Now, refresh System Profiler and check if it is enabled. If so, the Sudden Motion Sensor was manually turned off. The hardware is fine.

2. If after issuing the command there is a problem with the Sudden Motion Sensor, replace the main logic board.

Dropped frames or sound elements when recording audio or video

Occasionally the Sudden Motion Sensor technology may be activated by external vibrations at a time when the PowerBook is writing data intensively, such as recording video or audio.

Apple has adjusted this feature carefully to provide the best balance between protecting the hard drive and preventing unwanted activation of the Sudden Motion Sensor. Most PowerBook G4 users will never need to turn this feature off, and Apple suggests that you not modify the settings unless absolutely necessary.

In some environments, such as live concert halls, recording studios, or dance clubs, external vibrations may be major enough to cause the sensor to unexpectedly park the hard drive heads, resulting in interrupted sound or video playback. In these situations, you may find that you want to disable the feature temporarily.

To disable the Sudden Motion Sensor:

  1. From the Finder's Go menu, choose Utilities.
  2. In the Utilities folder, open Terminal.
  3. When the command line appears, type pmset -g # and press Return. This command queries the computer for the current setting of the Sudden Motion Sensor. The default setting is "1" (turned on).
  4. If the above command returns "1," you can disable the Sudden Motion Sensor by typing sudo pmset -a ams 0 and pressing Return (changing the setting to a zero
  5. Type your administrator password when you are prompted and press Return.
  6. Type the pmset -g # command again to be sure that the setting has been applied.

Any changes that you make to the Sudden Motion Sensor setting remains in effect even after you restart the computer. If you choose to disable the Sudden Motion Sensor, Apple recommends that you re-enable it as soon as possible in order to take full advantage of the feature.

To re-enable the Sudden Motion Sensor:

  1. From the Finder's Go menu, choose Utilities.
  2. In the Utilities folder, open Terminal.
  3. When the command line appears, type pmset -g # and press Return. If you have the Sudden Motion Sensor turned off, the command will return a zero (0).
  4. If the above command returns a zero, you can re-enable the Sudden Motion Sensor by typing sudo pmset -a ams 1 and pressing Return.
  5. Type your administrator password when you are prompted and press Return.
  6. Type the pmset -g # command again to be sure that the setting has been applied.

Note: The Sudden Motion Sensor will not prevent hard drive failures. Its primarily function is to prepare the hard drive for the impact of an accidental drop or severe vibration. It does not assist in the other ways hard drives fail.

The computer runs with battery, but not with the power adapter plugged into wall outlet

  1. Try known-good power outlet.
  2. Try known-good power adapter and power cord.

Note: Verify that power adapter connector glows amber or green. If the power adapter light is green, turn over the computer and press the battery button. One to five lights glow to show the battery's level of charge. One blinking light indicates that the battery does not have sufficient charge to turn on.

3. Reset the power manager by pressing the key combination Control-Option-Shift-power.

Warning: Make sure you do not hold down the "fn" key when resetting the power manager.

Warning: Resetting the power manager means you will also need to reset the date and time (using the Date & Time control panel).

  1. Replace DC-in board
  2. Replace DC-to-DC board.
  3. Replace logic board.

The computer runs when plugged into a wall outlet but not on battery power

  1. Reseat battery to verify battery is seated correctly with battery lock engaged.
  2. Try known-good charged battery.
  3. Reset the power manager by pressing key combination Control-Option-Shift-power.

Warning: Make sure you do not hold down the "fn" key when resetting the power manager.

Warning: Resetting the power manager means you will also need to reset the date and time (using the Date & Time control panel).

  1. Replace DC-to-DC board.
  2. Replace logic board.

The microphone is not working

  1. In the Sound preference pane select the microphone device is selected in the list.
  2. In the Sound preference pane select the midrange or above.

Input tab. Make sure that the internal Input tab. Make sure that the input volume is

  1. Create new Mac OS X user and log in as that user. (So that the customer does not question the new user, remove the user once disc is verified.)
  2. 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).
  3. Verify microphone cable connection to logic board.
  4. Replace top case (which includes the microphone).
  5. Replace logic board.

The latching mechanism that holds the display closed is not working

Note: As the display closes against the top case, a hook in the top of the display housing should be magnetically pulled down into a slot in the top case, and secured. When the latch button is pushed, the hook should release and retract into the display housing, allowing the display to open.

  1. Verify hook operation by exercising the latch mechanism.
  2. If the hook does not operate properly, replace the display bezel.
  3. If the latch or latch button does not operate properly, replace the bottom case assembly.

Fan fails

  1. Check fan cable connection, and check cable for damage.
  2. Replace fan.
  3. Replace logic board.

Block Diagram

Mini-DVI connector

FireWire 400 port

Ethernet port

USB 2.0 port USB 2.0 port

Modem port

Mini-DVI connector

FireWire 400 port

Ethernet port

Audio line in

Audio line out

Internal microphone

Built-in speakers

Mid-range enhance

USB 2.0 port USB 2.0 port

Modem port

Û Service Source

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DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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