Apple imac 20 inch mid 2009 User Manual

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Communications 61 2010-11-24
Ethernet Port/Device Issue
Unlikely cause:  LCD display, power supply, hard drive, optical drive, fans
Quick Check
SymptomsQuick Check
Ethernet Port/Device Issue
•  No ethernet device present
•  Unable to access network 
resources
•  Ethernet device shows no 
connection
•  Ethernet device unable to an IP 
address
•  Slow network performance 1.
  Check the ethernet cable for damage, try a 
known-good ethernet cable – CAT5 or better 
recommended for 100Mbps+ connections.
2.  Check ethernet ports on the Mac and wall/switch 
for dust, debris, damage or bent pins.
3.   Ensure distance from networking infrastructure is 
less than 300 feet/ 105 meters
4.  Verify port, cable and network hardware with a 
known-good system. Isolate firewall, MAC address 
filtering or hardware access control devices
5.   Isolate OS by starting up from original Install 
media for the computer, the same model 
computer in Target Disk Mode, or compatible 
known-good OS on an external drive.
Deep Dive
Check ResultAction Code
1.   Visually inspect the ethernet 
port of the computer to ensure 
that all pins will make physical 
contact with the CAT5 ethernet 
cable. Yes
Go to step 2.
No Pins are damaged, bent flat or 
missing. Replace logic board. M24
2.  Boot from original Install media. 
Verify Network Link status 
active by using Network Utility 
under the “Info” tab. Is the Link 
Status “Active”? Yes
Go to step 3.
No If same ethernet cable gives 
an “Active” link status on a 
known-good computer of 
same model, replace logic 
board M10
3.
  Connect the computer to 
another Macintosh computer 
using CAT5 ethernet cable. 
See kBase article http://
docs.info.apple.com/article.
html?path=Mac/10.5/en/8429.
html. Can you connect 
successfully? Yes
Ethernet communication 
good. Go to step 4.
No If same ethernet cable and 
computer connects to a 
known-good computer of 
same model, replace logic 
board. M10  
						

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Communications 62 2010-11-24
4. Check for speed and duplex 
issues on the network. Open 
System Preference > Network; 
click the Advanced button, 
then the Ethernet tab. Is the 
speed and duplex reported 
what is expected? Yes
Go to step 5.
No
Change the speed and duplex 
settings. See kBase article 
http://docs.info.apple.com/
article.html?path=Mac/10.5/
en/8711.html. Go to step 6.
5.   Check for MTU (Maximum 
Transmission Unit) issues. 
See article http://support.
apple.com/kb/HT2532. Does 
changing the MTU settings on 
the computer resolve the issue?  Yes
Go to step 6.
No Ethernet controller damaged. 
Replace logic board. M10
6.  If changing the speed, duplex 
or MTU settings allows 
connectivity, check with 
another computer of same 
model. Does the known-good 
computer produce the same 
results? Yes
Check with ISP or Network 
Administrator concerning 
speed, duplex and MTU 
settings.
No Verify with known-good OS. If 
the issue persists, replace the 
logic board. M10
Wireless Input Device Doesn’t Pair
Quick Check
Symptoms
Quick Check
Wireless Input Device Doesn’t 
Pair
•  Can’t get system to recognize 
the Bluetooth keyboard or 
mouse 1.
  Remove and reinstall the batteries for the device.
2.  Check that device is powering on.
3.   Use known-good batteries with the device.
4.  Ensure that device is being used within 30-foot 
range for Bluetooth devices.
5.   Ensure that the latest Software Updates have 
been applied.  
						

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Communications 63 2010-11-24
Deep Dive
CheckResultAction Code
1.   Without any wired input 
devices connected, start the 
computer. Does the computer 
show the Bluetooth Mouse 
Setup assistant? Yes
Bluetooth hardware is active. 
Go to step 4.
No Inspect and reseat Bluetooth 
cable to Bluetooth card. 
Replace a damaged cable.  
Go to step 2.
2.  Restart the machine without 
any wired input devices 
attached. Does the computer 
show the Bluetooth Mouse 
Setup assistant? Yes
Bluetooth hardware is active. 
Go to step 4.
No Reseat the Bluetooth card to 
the logic board. Go to step 3.
3.   Restart the machine without 
any wired input devices 
attached. Does the computer 
show the Bluetooth Mouse 
Setup assistant? Yes
Bluetooth hardware is active. 
Go to step 4.
No Replace the Bluetooth card.
4.  With a wireless mouse on, and 
in discoverable mode, can you 
successfully pair the mouse 
with the assistant? Yes
Check for stability.  
Go to step 5.
No
Go to Wireless Input Device 
Loses Connection.
5.   With the wireless mouse 
paired, does the mouse stay 
connected? Yes
Issue resolved.
No Inspect and reseat the 
Bluetooth antenna cable. 
Replace a damaged antenna 
cable (only available as part 
of rear housing) or Bluetooth 
card if the antenna connector 
is damaged. Go to step 6.
6.  With the wireless mouse 
paired, does the mouse stay 
connected? Yes
Antenna issue. Issue resolved.
No
Go to Wireless Input Device 
Loses Connection.  
						

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Communications 64 2010-11-24
Wireless Input Device Loses Connection
Quick Check
SymptomsQuick Check
Wireless Input Device Loses 
Connection
•  Wireless keyboard, mouse, or 
other wireless input device 
loses connection.
1.  Remove and reinstall the batteries for the device.
2.  Check that device is powering on.
3.   Use known-good batteries with the device.
4.  Ensure other devices pair and keep connection 
without issue. If not, go to AirPort/Bluetooth 
Issues.
5.   Ensure that device is being used within 30-foot 
range for Bluetooth devices.
6.  Ensure that the latest Software Updates have 
been applied.
Deep Dive
Check ResultAction Code
1.   Open System Preferences > 
Bluetooth. Paired items and 
their connection status are 
shown. Is the device listed? Yes
Device has been paired.  
Go to step 2.
No The device is not paired. Make 
device discoverable and open 
Bluetooth Setup Assistant.  
Go to step 3.
2.  Make sure device is on. 
In System Preferences > 
Bluetooth, select the device 
and from the Action menu 
(gear icon) choose “Connect”. 
Does the device connect 
successfully? Yes
Go to step 7.
No Delete pairing in System 
Preferences. Go to step 3.
3.   With the device on, run the 
Bluetooth Setup Assistant. 
Can you successfully pair the 
device? Yes
Go to step 7.
No Restart the machine.  
Go to step 4.
4.  With the device on, run the 
Bluetooth Setup Assistant. 
Can you successfully pair the 
device? Yes
Go to step 7.
No Create a new Admin User.  
Go to step 5.  
						

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Communications 65 2010-11-24
5.  Log into new Admin User 
account. With the device 
on, run the Bluetooth Setup 
Assistant. Can you successfully 
pair the device with the New 
User? Yes
User-based issue. 
Troubleshoot software on 
User account. No repair 
needed.
No Remove the following file: /
Library/Preferences/com.
apple.Bluetooth.plist   
Go to step 6.
6.  Restart the computer. With the 
device on, run the Bluetooth 
Setup Assistant. Can you 
successfully pair the device? Yes
Go to step 7.
No
Go to AirPort/Bluetooth 
Issues.
7.   With the device paired and 
connected, is the device 
connection stable if used 
normally?  Yes
Issue resolved.
No Check device documentation 
on standard length of 
operation, and other 
operational factors.  
Go to step 8.
8.  Is the device performing to 
stated specifications? Yes
Educate user. Issue resolved.
No Replace device.  
						

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Communications 66 2010-11-24
Uncategorized Symptoms
Quick Check
SymptomsQuick Check
Uncategorized Symptoms
•  Unable to locate appropriate 
symptom code.
1.  Verify System Preferences/Network settings 
are configured appropriately to support 
communication method.
2.  For ethernet connection issues verify that the 
cable being used functions when used with 
another known-good system.
3.   For wireless connection issues review user 
environment to determine whether possible 
interference from other 2.4GHz communications 
devices might be contributing to issue.  
http://support.apple.com/kb/HT1365
Deep Dive
Check ResultAction Code
1.   Verify whether existing 
symptom code applies to the 
issue reported by the user. Yes
Jump to appropriate 
symptom code flow.
No
Document reported failure 
and send feedback to 
[email protected] 
stating that a suitable 
symptom code wasn’t found. 
Provide as much detail as 
possible. N99  
						

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 67 2010-11-24
Input/Output Devices
Apple Remote Inoperable
Unlikely cause:  LCD display, power supply, hard drive, optical drive, fans
Quick Check
SymptomsQuick Check
Apple Remote Inoperable
•  Apple Remote doesn’t bring up 
Front Row
•  Apple Remote doesn’t control 
iTunes
•  Apple Remote doesn’t control 
computer volume 1.
  Make sure you’re using the Apple Remote 
within 30 feet of the computer, and have an 
unobstructed line-of-sight to the computer.
2.  Make sure you’re pointing the lens end of 
the Apple Remote directly at the front of the 
computer.
3.   Make sure “Disable remote control infrared 
receiver” checkbox in the Security preference 
pane is not checked.
4.  Ensure that all available Software Updates have 
been applied to the computer.
Deep Dive
Check ResultAction Code
1.   Open Photo Booth or iChat’s 
video preview window. Point 
the Apple Remote at the built-
in iSight camera and press any 
button on the Apple Remote. 
Do you see a white, flashing 
light in the video preview? Yes
The Apple Remote is 
functioning. Go to step 2.
No The Apple Remote is not 
functioning. Replace the 
Apple Remote battery.  
Go to step 3.
2.  Open System Preferences > 
Security. Is “Unpair” available in 
this preference pane? Yes
Click the “Unpair” button to 
disable possible pairing with 
another Apple Remote.  
Go to step 4.
No Possible IR board issue.  
Go to step 5.
3.   With a replacement battery, do 
you now see a white flashing 
light from the Apple Remote in 
the video preview window? Yes
Battery issue. Issue resolved. X05
No Apple Remote defective. 
Replace the Apple Remote. X04  
						

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 68 2010-11-24
4. After clicking “Unpair”, does the 
computer now respond to the 
Apple Remote? Yes
Pairing issue. Issue resolved.
No Possible IR board issue.  
Go to step 5.
5.   Open the Apple System Profiler. 
Selecting USB, do you see “IR 
Receiver” listed? Yes
IR Receiver reporting on USB 
bus. Check for lens block.  
Go to step 6.
No Inspect and reseat IR cable to 
IR board. If necessary, replace 
damaged IR cable. Go step 7.
6.  After clearing lens, does the 
computer now respond to the 
Apple Remote? Yes
Lens blocked. Issue resolved.
No Lens damaged or inoperable. 
Replace IR board.
7.   After reseating or replacing the 
IR cable, does the computer 
now respond to the Apple 
Remote? Yes
IR cable issue. Issue resolved. X03
No IR Receiver failure.  
Replace IR board.
Audio: Microphone
Unlikely cause:  LCD display, power supply, hard drive, optical drive, fans
Quick Check
Symptoms Quick Check
Audio: Microphone
•  Microphone not working
•  Microphone audio garbled
•  No sound 1.
  Verify that no tape, sticky notes, or other objects 
are blocking the microphone port that is located 
on top of the front bezel above the camera. The 
microscopic perforations on top of the front 
bezel must be free of obstructions in order for 
the microphone to function.
2.  Launch System Preferences and select Sound/
Input options. Verify that the sound input option 
is set to system’s internal microphone. 
3.   Launch System Preferences and select Sound/
Input options. Verify that the ‘Input Volume’ 
setting is not set at the minimum level. 
4.  Launch System Preferences and select Sound/
Input options. Verify that ‘Input Level’ indicator 
moves when speaking into the microphone.  
						

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 69 2010-11-24
Deep Dive
CheckResultAction Code
1.   Verify that boot chime is 
present when system is 
powered on. Note: make sure 
audio output preferences are 
not set to mute. Yes
Go to step 2.
No Audio board not detected by 
system. Reseat audio board, 
then replace audio board if 
problem persists. M09
2.  Launch System Preferences and 
select Sound/Input options. 
Verify that system’s Internal 
Microphone is selected. Yes
 Go to step 3.
No Select display’s internal 
microphone. Retest.
3.   Launch System Preferences and 
select Sound/Input options. 
Verify that ‘Input Volume’ is set 
above minimum sensitivity. Yes
Go to step 4.
No Set ‘Input Volume’ slider to the 
middle position. Retest.
4.  Launch System Preferences and 
select Sound input options. 
Verify that ‘Input Level’ indicator 
moves when speaking into the 
microphone. Yes
Microphone and audio board 
functioning. Go to step 6.
No Suspect bad microphone. 
Replace front bezel which 
contains the microphone. M09
5.   Disconnect, carefully 
inspect, then reconnect 
the microphone cable and 
connectors where they mate 
with the front bezel and the 
audio board. Was any damage 
to the cabling or connectors 
observed? Yes
Replace damaged part  
(front bezel, audio board,  
or microphone cable).  
Go to step 7. L14
No Go to step 6.
6.  Record sound sample using 
Garageband or iMovie HD. 
Verify that sound quality of 
sound sample is normal during 
playback. Yes
Microphone circuitry OK. 
Return system to user.
No Replace front bezel which 
includes the microphone. M09  
						

							iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 70 2010-11-24
Audio: Built-in Speakers Have Distorted Sound
Unlikely cause:  LCD display, power supply, hard drive, optical drive, fans
Quick Check
SymptomsQuick Check
Audio: Built-in Speakers Have 
Distorted Sound
•  No audio from one or both 
speakers
•  Audio from speakers distorted 1.
  Launch System Preferences and select Sound/
Output options. Verify that the sound output 
option is set to system’s internal speakers and the 
balance control is set to the center position. 
2.  Obtain known-good high-quality sound file 
or use iTunes music store sound samples to 
evaluate sound quality. Verify suspect sound files 
on another system to determine whether the 
distortion is caused by the system or the sound 
file.
3.   Set volume control to mid-range. Overdriving the 
built-in speakers can cause distortion.
Deep Dive
Check ResultAction Code
1.   Launch System Preferences and 
select Sound/Output options. 
Set speaker balance 100% 
to LEFT speaker then play a 
sound file. Verify that sound is 
generated by the LEFT speaker 
and that the sound quality is 
acceptable. Yes
LEFT speaker and amplifier 
circuitry OK. Go to step 2.
No Distortion detected in LEFT 
speaker. Set ‘Balance’ slider to 
the middle position.  
Go to step 3.
2.  Set speaker balance 100% to 
RIGHT speaker then play a 
sound file. Verify that sound 
is generated by the RIGHT 
speaker and that the sound 
quality is acceptable. Yes
RIGHT speaker and amplifier 
circuitry OK. Set ‘Balance’ 
slider to the middle position. 
Go to step 3.
No Distortion detected in RIGHT 
speaker. Go to step 4.
3.   Connect external speakers or 
headphones to Headphone 
Out port then play a sound 
file. Verify that sound quality is 
acceptable. Yes
Suspect bad speaker.  
Go to step 4.
No Audio CODEC or amplifier 
issue suspected. Replace 
audio board. Retest. M09