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Apple imac 20 inch early 2008 User Manual

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    							iMac (20-inch Early 2008) 261
    IR Sensor/Receiver
    Supported applications do not respond to input from the remote control
    Perform the checks above under “IR Remote” to verify that the Apple Remote is functioning 1. 
    correctly, and retest. Do supported applications now respond to input from the IR remote? 
    Yes: Problem resolved. 
    No: Go to the next step.
    Verify that the IR Sensor can be seen in the Apple System Profiler. Open the Apple System 2.  
    Profiler and click on the “USB” section. You should see the following listed: 
     
    Do you see the IR Receiver listed under the USB section of the Apple System Profiler? 
    Yes: Go on to the next step. 
    No: Replace the IR cable and retest. Refer to the “IR Board” take apart procedure 
    Do supported applications now respond to input from the IR remote? 
     Yes: Problem resolved. 
     No: Replace the IR sensor board and retest. Refer to the “IR Board” take apart procedure. 
    If the issue persists after replacing these parts, replace the logic board.
    Access System Preferences and click Security. In the Security pane check the following: 3. 
    • Make sure “Disable remote control infrared receiver” checkbox is not checked.  
    • If “Unpair” is available in the Security pane of System Preferences, another Apple Remote 
    may be paired to the computer (pairing allows only one Apple Remote to control the 
    computer). To delete a pairing between the remote and the iMac G5 (iSight),  click Unpair. 
    (You may have to enter your Administrator password to make changes in the Security pane.) 
    After making sure these features are disabled, does the Apple Remote control the machine 
    now? 
    Yes: Problem resolved. 
    No: Replace the IR sensor board and retest. Refer to the “IR Board” take apart procedure. 
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  262
    Built-in iSight Camera
    The built-in camera is not recognized
    Boot the 1. computer to the desktop and launch iChat AV. Note: You do not need to be 
    connected to a network to use iChat AV to troubleshoot. Verify that the correct versions of 
    Mac OS X and iChat AV are installed. Reinstall or update software as needed. 
    Open the iChat AV preferences and click on the ‘Video’ icon. Verify whether the camera is 2.  
    recognized by the iChat AV software. Is the camera recognized? 
     
    Yes: the camera is recognized and video preview is normal: This indicates the camera is 
    functioning. Pull down the ‘Video’ options from the menu bar and verify that the camera is 
    enabled. The camera must be enabled to function. 
     
    No: the camera is not recognized and no video preview is visible. This indicates the camera 
    may not be functioning properly or the camera cable is disconnected.  Open the iMac and 
    inspect the camera board (inside the front bezel) and the attached cable. Reseat the cable 
    on the camera board and check the other end of the camera cable connections to the 
    logic board. The camera cable connectors are on the right side of the logic board, below 
    the optical drive and to the right of the fan. Go on to the next step if this didn’t solve your 
    problem.
    Replace the camera board.3. 
    Replace the camera cable.4. 
    If the iSight camera still doesn’t appear in System Profiler on the USB bus after replacing the 5. 
    camera board or camera cable, replace the logic board.
    Camera recognized but no video
    Verify that the lens assembly for the iSight camera located in the top middle of the front 1. 
    bezel is not obstructed by anything including Post-It notes or other objects. 
    Open the iMac and inspect the camera board (inside the front bezel) and the attached cable.2.  
    Replace the camera board in the front bezel and retest.3. 
    Camera image quality poor
    The built-in camera is recognized by iChat AV and other supported video applications however 
    the image quality is poor.
    Verify that the lens assembly for the iSight camera is clean. Fingerprints and other 1. 
    contaminants can affect image quality. Clean the lens using a lint free lens cleaning cloth 
    being while being careful not to scratch the lens.
    Verify that there is sufficient lighting to produce a good quality image. Lighting which is 2.  
    comparable to that found in a well lit office will product a good quality image. If possible, 
    avoid having a brightly lit background. Diffused lighting is preferred over direct lighting.
    Launch iChat AV and open the iChat AV preferences. Click on the ‘Video’ tab. Is the video 3.  
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  263
    quality acceptable? 
      Ye s: The camera is functioning normally. The image quality problems may be caused by 
    bandwidth limitations when using iChat over the internet. Instruct the customer to use the 
    iChat AV connection doctor feature to verify that there is sufficient bandwidth to have a 
    video iChat session without a significant degradation of image quality. 
     
    No:  The camera may not be functioning normally. Replace the front bezel for poor image 
    quality. If the issue persists, replace the camera board and retest.
    Camera recognized but no audio
    Open the System Preferences window and click on Sound. 1. 
    Verify that the built in iSight camera has been selected as the device for sound input2.  . 
    Verify that the volume settings (on the slider bar) are appropriate. 3. 
    Launch iChat AV and open the iChat AV preferences. Click on the ‘Video’ icon. Speak into 4. 
    the microphone while monitoring the microphone level indicator. Does the line level meter 
    respond while you are speaking? 
     
    Yes: The microphone circuit is functioning correctly. Check the preference settings of any 
    supported AV applications the customer is experiencing problems with to make sure that 
    the microphone feature is enabled and that the internal iSight microphone has been 
    selected as the input device. 
     
    No: Inspect both ends of the camera/microphone cable. If the microphone cable is damaged, 
    replace the front bezel and retest. If the issue persists, replace the camera/microphone cable.
    Audio quality is 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 built-in camera 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. Is the sound quality acceptable? 
     
    Ye s: The microphone is functioning normally.  The audio quality problems may be caused by 
    bandwidth limitations when using iChat over the internet. Instruct the customer to use the 
    iChat AV connection doctor feature to verify that there is sufficient bandwidth to have an 
    audio iChat session without a significant degradation of audio quality.  
    iChat AV allows the user to limit the allocated bandwidth which could impact audio quality. 
    Check the settings and increase the bandwidth if needed. 
    No: The microphone may be faulty. Replace the front bezel which houses the microphone. 
    Check connections on the Audio board. If the problem persists, replace the Audio board.3.  
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  264
    Speakers
    Can’t hear sound from the speakers
    Disconnect any external microphones, speakers, or headphones. 1. 
    Access System Preferences and select Sound. In the Sound pane, select Output and make 2.  
    sure the Internal speakers are selected as the device for sound output, the Output volume is 
    adequate, and Mute is not selected.  Do you have sound now? 
    Yes: Problem resolved. 
    No: Go to the next step.  
    Reset parameter RAM. Press Command-Option-P-R during startup but before “Welcome to 3. 
    Macintosh” appears. Do you have sound now?  
    Yes: Problem resolved. 
    No: Go to the next step. 
    Plug headphones or external speakers into the Line out /headphone port. Do you have 4. 
    sound through these devices when plugged in? 
    Yes: Verify that the speaker cable connector is securely attached to the audio board. If the 
    issue persists, replace the speakers. 
    No: Replace the logic board
    Verify that the speaker cable connector is securely attached to the audio board. Do you have 5. 
    sound now? 
    Yes: Problem resolved. 
    No: Replace the audio board. If the problem persists, replace the main logic board.
    I hear sound out of only one speaker
    Are there any external microphones, speakers or headphones plugged into the iMac?  1. 
    Yes: Disconnect any external microphones, speakers, or headphones. Do you hear audio from 
    both of the built in speakers on your iMac? 
      Yes: Good. It looks like the built-in speakers are working properly. This may be an issue 
    with the microphone, speakers or headphones that were plugged into your iMac. Please 
    work with the manufacturer to troubleshoot this issue. 
     No: Go to step 2. 
    No: Check your speaker balance. If your balance setting was set to the left or right speaker, 
    you would only hear sound from one speaker. Go to step 2.
    Open System Preferences. (System Preferences can be found under the Apple menu.)2.  
    Click once on the sound icon. Click once on the Output tab.3. 
    Make sure your balance setting is in the middle. After adjusting the audio balance, do you 4. 
    have audio from both speakers now? 
    Yes: It looks like the issue was the balance was not set properly. 
    No: Replace the speakers.
    If the speakers did not solve the problem, replace the audio board.5. 
    If the audio board doesn’t solve the problem, replace the logic board.6.  
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  265
    Mouse (also see Wireless Issues topic)
    The scroll bar on my mouse does not work in all directions
    See Knowledge Base article 302417, for instructions and a QuickTime movie demonstration on 
    how to clean the scroll ball. 
    My mouse doesn’t work at all
    Turn over the mouse and check the if the red LED on the underside of the mouse. Is the LED 1. 
    lit? 
     
    Yes: The mouse has power. Try using the mouse on another surface. Non-reflective, opaque 
    surfaces without repetitive patterns work best. The surface should be clean, but not shiny. 
    Optical mice won’t work on glass, mirrored surfaces, glossy materials or mouse pads with 
    pictures. 
     
    No: There is no power to the mouse. Try plugging the mouse into one of the USB ports 
    on the machine. If the mouse won’t power on from any USB port, try it on a known good 
    machine. If the mouse fails to power on with known good machine, replace the mouse. If the 
    mouse will power on with a known good machine, replace the main logic board.
    If the underside LED is lit and the surface is good, and the mouse still does not track, try 2.  
    plugging the mouse into another USB port on the machine. Does the mouse track now? 
     
    Ye s: Issue resolved. Try the other USB ports on the system to make sure you don’t have a bad 
    port. 
    No: Try using a known good mouse. If a known good mouse resolves the issue, replace the 
    mouse. If a known good mouse does not resolve the issue, replace the main logic board.
    My mouse works intermittently (the cursor freezes randomly) or is slow to 
    respond
    Try using the mouse on another surface. Non-reflective, opaque surfaces without repetitive 1. 
    patterns work best. The surface should be clean, but not shiny. Optical mice won’t work on 
    glass, mirrored surfaces, glossy materials or mouse pads with pictures. Does the mouse track 
    correctly on a proper surface? 
    Ye s: Issue resolved. 
    No: Check the Mouse Tracking setting in the Mouse control panel. 
    Boot to another volume (like the System Install Disc). Does the mouse track properly now? 2.  
    Ye s: Reinstall System Software 
    No: Try a using a known good mouse. If a known good mouse resolves the issue, replace the 
    mouse. If the issue persists with a known good mouse, replace the main logic board. 
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  266
    Mouse tracking issues
    f your Mighty Mouse is covered in fingerprints or its surface has become soiled, it can be gently 
    wiped with a clean lint-free cloth. If necessary, moisten the cloth using only water, making sure 
    not to oversaturate it. Be aware that the mouse contains electronic components that may be 
    damaged if water drips from the cloth into the mouse via the seam around the scroll ball or 
    around its underside.
    The same procedure can be used to clean the scroll ball on your Mighty Mouse if it has become 
    discolored or dirty. Use a clean lint-free cloth lightly moistened with water. Wipe the ball and 
    the surrounding area, making sure to rotate the ball itself to ensure complete coverage. If the 
    scrolling feels rough or if the scroll ball isn’t scrolling up, down, or side-to-side, hold the mouse 
    upside-down and roll the ball vigorously while cleaning it to help dislodge any particles that may 
    have collected on the internal hardware. Refer to Knowledge Base document 302417.
    Apple Wireless mouse is not responding
    If the wireless mouse exhibits any of these symptoms, refer to Knowledge Base document 86496 
    - Apple Wireless Keyboard and Mouse: Troubleshooting connection Issues.
    You can’t wake the computer up using the Apple Wireless Keyboard or Apple Wireless • 
    Mouse.
    You can’t pair the computer with the Apple Wireless Keyboard or Apple Wireless Mouse.• 
    You can’t maintain a connection between the computer and the Apple Wireless Keyboard or • 
    Apple Wireless Mouse
    Keyboard (also see Wireless Issues topic)
    Certain keys or none of the keys function
    Unplug all devices from your computer, including your mouse and keyboard as well as 1. 
    printer, scanner, external hard drives, and hubs. ( Warning: Some devices may require you 
    to perform steps before it is safe to unplug them, e.g., external storage devices.) Be sure to 
    unplug your hub, if you have one.
    Plug your keyboard into the back of your computer firmly and securely. Plug your mouse 2.  
    into the back of your computer firmly and securely. Take special care to make sure the 
    connector is completely in the socket. Go on to step 3.
    Does your keyboard work now? 3. 
    Yes: Problem solved. 
    No: Unplug your keyboard and plug it into another USB slot on the back of your iMac.  Does 
    it work now? 
     Yes: Replace the logic board. 
     No: Unplug your keyboard and plug your mouse into the port the keyboard just 
    occupied. Go on to step 4.
    Does your mouse work now? 4. 
    Yes: Replace the keyboard.  
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  267
    No: Replace the logic board.
    My keys are sticky or slow to respond
    Try a known good keyboard.1. 
    Open System Preferences. Click on the keyboard and mouse icon. Adjust the “key repeat 2.  
    speed and delay until repeat” rate.
    Replace the keyboard.3. 
    When I type, strange characters appear on the screen
    Depending on your iMac’s settings, a simple keystroke can change your keyboard from 1. 
    English to Japanese. This can result in some pretty funny characters showing up when you 
    type. To switch to the US keyboard,
    Open System Preferences. 2.  
    Click on the International icon. 3. 
    Click on the Input Menu near the top of the screen.4. 
    Scroll down the list and uncheck any non-US keyboard layouts.5. 
    Close the System Preferences. Try typing a few characters. Did is solve the problem? 6. 
    Yes: Problem solved. 
    No: Replace the keyboard.
    The USB port on my keyboard doesn’t work
    Unplug all devises from your keyboard.1. 
    Plug your Apple mouse into the left USB port on your keyboard. Does your mouse work 2.  
    when it’s plugged into this port? 
     
    Yes: Now plug the mouse into the right port. Does it work? 
     Yes: Try a known good keyboard. 
     No: Try a known good mouse to rule out the mouse. Then go to step 3. 
    No: Try a different mouse or keyboard.
    Now unplug the keyboard from the USB port on the back of the iMac, and plug the mouse 3. 
    into the port the keyboard had been in. Does the mouse work now? 
    Yes: Replace the keyboard? 
    No: It appears that your USB port isn’t functioning properly. Go on to step 4.
    Replace the logic board.4.  
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  268
    Wireless Issues (also see Additional Wireless Topics)
    The aluminum Apple Wireless Keyboard will not turn on.
    Confirm that the batteries are installed properly and the batteries are known good.1. 
    Open the battery compartment over. Make sure to install the positive and negative ends of 2.  
    the batteries in the keyboard as shown. The keyboard will not turn on if the batteries are 
    incorrectly installed.
    Replace the battery compartment cover.3. 
    Turn on the keyboard by pressing the Power On switch. 4. Important: After three minutes, 
    the LED light turns off. The keyboard is still on, but it is no longer discoverable. To make it 
    discoverable again, turn it off and then turn it back on.
    Does the LED Power On light come on and then go off? 5. 
    Yes:  Yes, the LED comes on solid and then goes off.  This indicates the keyboard is already 
    paired with a system and the keyboard is within range of a system. Issue solved. 
    No:  The LED blinks. This means the keyboard is not paired, but it’s within range of a system 
    and it can be paired.  Go on to the next step.
    Use the Bluetooth Setup Asssitant. 6. 
    Open System Preferences and click Bluetooth. 7. 
    Click Devices, and then click Set Up New Device. Follow the onscreen instructions.8.  
    Is the keyboard functioning now? 9. 
    Ye s: Issue solved. 
    No: Follow the wireless keyboard set up steps on the next page. 
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  269
    Can not set up the aluminum Apple Wireless Keyboard
    Confirm that you have Mac OS X v10.4.10 or later installed and install the keyboard software 1. 
    update. If using Mac OS X 10.4.5 or later the keyboard software update is not needed.
    Install the batteries. Use a coin to remove the battery compartment cover.2.  
    Slide the batteries into the battery compartment as shown below. Replace the battery 3. 
    compartment cover and leave the keyboard turned off.
    Open the Bluetooth Setup Assistant.4. 
    Click Continue.5. 
    At the Select Device Type panel, select Keyboard. Do not click Continue yet.6. 
    Turn on the keyboard. The light above the power switch should begin to flash.7. 
    Click Continue. After 15-30 seconds, the keyboard’s name should appear in the device list of 8.  
    the Search pane.
    Select the keyboard in the Setup Assistant listing, then click Continue. The assistant will try to 9. 
    pair with the keyboard.
    When the Setup Assistant prompts you to do so, type the passkey shown in the Setup 10.   
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  270
    Assistant on the Apple Wireless Keyboard. Press the Return key on the keyboard when you 
    are finished.
    Once the assistant says the computer and keyboard have successfully paired, click Continue.11 . 
    Setup is complete. Click Quit.12.  
    The LED is flashing on the keyboard or mouse
    When your Apple Bluetooth mouse or keyboard is turned on, the light flashes twice in 
    succession, and then repeats, (blink-blink-pause, blink-blink-pause). This means the keyboard 
    or mouse is discoverable by your computer, and you can pair with it. After three minutes, the 
    indicator light turns off. The keyboard or mouse is still on, but it is no longer discoverable. To 
    make it discoverable again, turn it off and then turn it back on. The keyboard on/off switch is 
    harder to find, so it’s shown below. The mouse on/off switch is on the underside of the mouse.
    When the Bluetooth keyboard or mouse connects with your computer, the indicator light glows 
    steady for 3 seconds before it turns off. This indicates the keyboard or moused has successfully 
    paired with your computer.
    While your Bluetooth mouse is connected to your computer, the indicator light blinks at a regular 
    interval. It could blink fast or slow, but in all cases, a regular blinking pattern means the mouse is 
    connected to your computer and is operating properly. The Bluetooth keyboard indicator light 
    does not blink once it has made a connection to your computer.
    The LED goes out on the keyboard
    The LED in the top right-hand corner on the keyboard turns off several seconds after powering 
    on the keyboard making it appear that the keyboard is turned off.  This is normal keyboard 
    behavior. Note: The LED is not a power indicator. 
    						
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