Apple imac 21 5 inch late 2009 User Manual

iMac (21.5-inch, Late 2009) Symptom Charts — Communications 71 2010-11-18
3.  After cable has been replaced, 
verify if AirPort card is now 
listed in System Profiler. Yes
Issue resolved by replacing 
AirPort cable. X03
No Replace AirPort card carrier 
board and re-test. If issue 
persists (card not seen on 
bus), replace AirPort card. M11
4.
 Enable AirPort and verify if 
known local AirPort networks 
are available, or create a 
computer-to-computer 
network with another 
Macintosh computer using...

iMac (21.5-inch, Late 2009) Symptom Charts — Communications 72 2010-11-18
AirPort Card Kernel Panic
Quick Check
SymptomsQuick Check
AirPort Card Kernel Panic
•  Kernel Panic on startup
•  Kernel Panic or freezing while 
attempting to connect to WiFi 
networks
•  Kernel Panic while transferring 
data on WiFi networks 1.
  Isolate OS by starting up from original Install 
media for this computer, a same-model computer 
in Target Disk Mode, or compatible known-good 
OS on an external drive. AirPort and...

iMac (21.5-inch, Late 2009) Symptom Charts — Communications 73 2010-11-18
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.
  Verify if Ethernet cable is inserted into port 
correctly.  Check Ethernet cable for...

iMac (21.5-inch, Late 2009) Symptom Charts — Communications 74 2010-11-18
4. Check for speed and duplex 
issues on network. Open 
System Preference > Network; 
click the Advanced button, 
then the Ethernet tab. Verify if 
the speed and duplex reported 
are what is expected. Yes
Go to step 5.
No
Change speed and duplex 
settings. See 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 
kBase #HT2532: Mac...

iMac (21.5-inch, Late 2009) Symptom Charts — Communications 75 2010-11-18
Deep Dive
CheckResultAction Code
1.   Without any wired input 
devices connected, and with a 
wireless mouse in discoverable 
mode, startup computer. Verify 
if computer shows Bluetooth 
Mouse Setup Assistant. Yes
Bluetooth hardware is active. 
Go to step 6.
No Go to step 2.
2.  Connect a wired mouse and 
run System Profiler. Verify if 
Bluetooth interface is listed 
under USB in System Profiler. Yes
Bluetooth hardware is 
present....

iMac (21.5-inch, Late 2009) Symptom Charts — Communications 76 2010-11-18
8. With wireless mouse paired, 
verify if mouse stays connected. Yes
Issue resolved.
No Inspect and reseat Bluetooth 
antenna cable. Replace a 
damaged antenna cable, or 
Bluetooth board if its antenna 
connector is damaged.  
Go to step 9.
9.   With wireless mouse paired, 
verify if mouse stays connected. Yes
Antenna issue. Issue resolved.
No
Go to Wireless Input Device 
Loses Connection symptom 
flow.
Wireless Input Device Loses...

iMac (21.5-inch, Late 2009) Symptom Charts — Communications 77 2010-11-18
2. Make sure device is on. 
In System Preferences > 
Bluetooth, select device and 
from the Action menu (gear) 
choose “Connect”. Verify if 
device connects successfully. Yes
Go to step 7.
No Delete pairing in System 
Preferences. Go to step 3.
3.   With the device on, run 
Bluetooth Setup Assistant. 
Verify if you can successfully 
pair the device. Yes
Go to step 7.
No Restart computer.  
Go to step 4.
4.  With device on, run...

iMac (21.5-inch, Late 2009) Symptom Charts — Communications 78 2010-11-18
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 cable 
being used functions when used with another 
known-good system.
3.   For wireless connection issues review user 
environment to determine whether...

iMac (21.5-inch, Late 2009) Symptom Charts — Input/Output Devices 79 2010-11-18
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 Apple Remote is within 30 ft. of 
computer, and has an unobstructed line-of-sight 
to computer.
2.  Make...

iMac (21.5-inch, Late 2009) Symptom Charts — Input/Output Devices 80 2010-11-18
4. After clicking “Unpair”, verify if 
the computer now responds to 
the Apple Remote. Yes
Pairing issue. Issue resolved.
No Possible IR board issue.  
Go to step 5.
5.   Open System Profiler. Verify if 
“IR Receiver” is listed in USB list 
of devices. Yes
IR board reporting on USB 
bus. Check for lens block.  
Go to step 6.
No Inspect and reseat IR cable 
connection to logic board.  
Go to step 7.
6.  Check that IR board is...