Apple imac 20 inch mid 2009 User Manual

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 71 2010-11-24
4. Inspect LEFT and RIGHT speaker 
cones and speaker connection 
cable for damage. Do speakers 
have visible damage? Yes
Replace damaged speaker. 
Retest. M09
No Go to step 5.
5.   Install known-good speaker 
into location where distorted 
sound was heard. Verify that 
sound quality improves. Yes
Speaker bad. Replace speaker 
and retest.  M09
No Suspect speaker amplifier. 
Replace audio board. M09
Audio: Built-in Speakers...

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 72 2010-11-24
2. 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 3.
No Go to step 6.
3.   Set speaker balance 100% to 
RIGHT speaker then play a 
sound file. Verify that sound 
is generated by the RIGHT...

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 73 2010-11-24
Camera Issues
Unlikely cause:  LCD display, power supply, hard drive, optical drive, fans, speakers, microphone
Quick Check
SymptomsQuick Check
Camera Issues
•  Camera not detected
•  No green LED for camera
•  Excessive blooming
•  Poor white balance
•  Poor focus
•  Green image
•  Image distortion 1.
  Launch System Profiler and confirm that system’s 
USB hub and built-in camera are visible.
2.  Verify camera lens and...

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 74 2010-11-24
FireWire Devices Not Recognized
Unlikely cause:  LCD display, power supply, hard drive, optical drive, fans
Quick Check
SymptomsQuick Check
FireWire Devices Not Recognized
•  FireWire external drive not 
recognized
•  FireWire printer not recognized 1.
  For external FireWire drives, make sure any 
external power source is plugged in and 
operating to isolate a power issue with the 
device.
2.  Test with a known-good...

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 75 2010-11-24
4. Is the FireWire device 
recognized with a known-good 
FireWire cable on the user’s 
computer? Yes
FireWire cable issue. Issue 
resolved.
No FireWire device may need 
additional power. Use a 
powered FireWire hub. If the 
issue persists, check for any 
firmware updates for the 
FireWire device. Go to step 5.
5.   Using a powered FireWire 
hub, and having installed any 
software or firmware update 
for the device, is the...

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 76 2010-11-24
USB Devices Not Recognized
Unlikely cause:  LCD display, power supply, hard drive, optical drive, fans
Quick Check
SymptomsQuick Check
USB Devices Not Recognized
•  USB wired keyboard/mouse not 
recognized
•  USB external drive not 
recognized
•  USB printer not recognized 1.
  For printers and external USB drives, make sure 
any external power source is plugged in and 
operating to isolate a power issue with the 
device....

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 77 2010-11-24
3.  Are known-good mouse and 
keyboard recognized? Yes
Test original mouse and 
keyboard. Replace if still not 
recognized. Go to step 5.
No External USB ports not 
functioning. Replace logic 
board.
4.  With no USB devices 
connected, restart the 
computer. Did Bluetooth 
Mouse Setup assistant launch 
after startup? Yes
Bluetooth detected via 
Internal USB. Go to step 3.
No Bluetooth not recognized 
via internal USB....

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 78 2010-11-24
Wired Keyboard Does Not Function Properly
Unlikely cause:  LCD display, power supply, hard drive, optical drive, fans
Quick Check
SymptomsQuick Check
Wired Keyboard Does Not 
Function Properly
•  Some or all keys on the 
keyboard don’t work
•  Eject key or Caps Lock key 
doesn’t seem to work
•  Some keys don’t work as 
expected 1.
  The iMac has 4 USB ports on the rear of the 
computer. Make sure to try each port to...

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 79 2010-11-24
5.  With optical media in the drive, 
hold the Media Eject key. Does 
the disc eject normally and the 
eject symbol appear? Yes
Media Eject key delay. No 
repair necessary.
No
Go to Optical Drive Won’t 
Accept/Eject Media.
6.  Open System Preferences > 
Universal Access > Keyboard. Is 
“Slow Keys” enabled? Yes
With “Slow Keys” on, you need 
to press a key for a longer 
period of time for it to be 
recognized.
No Go to step...

iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 80 2010-11-24
Keyboard: Specific Keys Do Not Respond
Unlikely cause:  LCD display, power supply, hard drive, optical drive, fans
Quick Check
SymptomsQuick Check
Keyboard: Specific Keys Do Not 
Respond
•  One or more keys do not 
respond when pressed
•  Key sticks
•  Keycap missing
1.  If wireless keyboard is being used verify that 
it is properly paired with the system. Jump to 
Wireless Input Device Doesn’t Pair to resolve 
pairing...