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Apple imac 20 inch early 2009 User Manual

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Page 41

iMac (20-inch, Early/Mid 2009) Symptom Charts — Display 41 2010-11-24
Pixel Anomalies
Unlikely cause:  logic board, power supply, hard drive, optical drive, fans, speakers, camera, 
microphone
Quick Check
SymptomsQuick Check
Pixel Anomalies
•  Dark dot anomalies
•  Bright dot anomalies
•  Debris on inside surface of 
glass panel
•  Debris on surface of LCD panel
1.  Clean outside surface of glass panel using 
provided cleaning cloth.
2.  For information about pixel anomalies, see kBase 
article:...

Page 42

iMac (20-inch, Early/Mid 2009) Symptom Charts — Display 42 2010-11-24
Vertical/Horizontal Lines
Unlikely cause:  power supply, hard drive, optical drive, fans, speakers, camera, microphone
Quick Check
SymptomsQuick Check
Vertical/Horizontal Lines
•  Vertical lines
•  Horizontal lines 1.
  Boot from install DVD to determine whether 
potential software issue exists.
2.  Verify if issue is visible on an external display.
Deep Dive
Check ResultAction Code
1.   Boot from Install DVD and 
verify whether issue...

Page 43

iMac (20-inch, Early/Mid 2009) Symptom Charts — Display 43 2010-11-24
6. Verify whether issue is still 
visible after reinstalling LVDS 
cable. Yes
Replace LCD panel.  
Go to step 7.
No Issue resolved with 
replacement logic board. 
Return computer to user. M04
7.   Verify whether issue is still 
present with replacement LCD 
panel installed. Yes
Return to step 1 and retest.
No Issue resolved with 
replacement LCD panel. 
Return computer to user. L04  

Page 44

iMac (20-inch, Early/Mid 2009) Symptom Charts — Display 44 2010-11-24
Non-Uniform Brightness
Unlikely cause:  power supply, hard drive, optical drive, fans, speakers, camera, microphone
Quick Check
SymptomsQuick Check
Non-Uniform Brightness
•  Brightness not uniform 
•  Color not-uniform 1.
  Verify System Preferences > Displays > Brightness 
level control is set above minimum.
2.  Allow 15 minutes for backlight bulbs to reach 
normal operating temperature and output before 
evaluating display. 
3....

Page 45

iMac (20-inch, Early/Mid 2009) Symptom Charts — Display 45 2010-11-24
Cosmetic Defects
Quick Check
SymptomsQuick Check
Cosmetic Defects to LCD
•  Cracked LCD
•  Scratched LCD polarizer 
•  Scorched or melted LCD
•  LCD impact damage
•  Foreign material on LCD or 
back side of glass panel.
1.  Determine whether damage was caused by 
user environment, accidental damage, or abuse. 
If applicable, inform the user that Apple does 
not warrant damage caused by accident, abuse, 
misuse, flood, fire, earthquake,...

Page 46

iMac (20-inch, Early/Mid 2009) Symptom Charts — Mass Storage 46 2010-11-24
Mass Storage
Hard Drive Not Recognized
Unlikely cause:  LCD panel, power supply, fans, speakers, camera, microphone
Quick Check
SymptomsQuick Check
Drive Not Recognized (H01) 
Drive No Boot (H02)
•  Flashing Question Mark
•  Boots to Grey Screen
•  Boots to Blue Screen 1.
  Use a known-good mouse. A stuck mouse button 
will not allow boot.
2.  Boot from Install DVD. Verify S.M.A.R.T. status of 
drive using Disk Utility.
3....

Page 47

iMac (20-inch, Early/Mid 2009) Symptom Charts — Mass Storage 47 2010-11-24
6. Reseat SATA and logic board 
hard drive connections and 
verify whether computer starts 
up. Yes
Go to step 8.
No Replace SATA cable.  
Go to step 8. H04
7.   Test with known-good hard 
drive. Verify that system boots 
successfully and that Disk utility 
‘Verify’ function reports no 
errors. Yes
Install user drive. Go to step 9.
No SATA cable verified or 
replaced and known-good 
hard drive installed. Suspect 
possible SATA...

Page 48

iMac (20-inch, Early/Mid 2009) Symptom Charts — Mass Storage 48 2010-11-24
Hard Drive Read/Write Error
Unlikely cause:  LCD panel, power supply, fans, speakers, camera, microphone
Quick Check
SymptomsQuick Check
Drive Read/Write Error (H03) 
Drive Bad Sector/Defective (H05) 
Drive Formatting Issues (H07)
•  Cannot save documents
•  Read/write error message
•  Hang when accessing or saving 
data 1.
  Boot from Install DVD. Verify S.M.A.R.T. status of 
drive using Disk Utility.
2.  Repair disk using Disk...

Page 49

iMac (20-inch, Early/Mid 2009) Symptom Charts — Mass Storage 49 2010-11-24
7.  Reboot computer. Verify that 
system boots successfully and 
that Disk Utility ‘Verify’ function 
reports no errors. Yes
Issue resolved. Return system 
to user.
No Go to step 6.
8.  Reboot computer. Verify that 
system boots successfully and 
that Disk Utility ‘Verify’ function 
reports no errors. Yes
Issue resolved.
No Hard drive appears to be 
defective Go to step 9.
9.   Replace user hard drive. Does 
drive format correctly...

Page 50

iMac (20-inch, Early/Mid 2009) Symptom Charts — Mass Storage 50 2010-11-24
3.  Restart the computer. Verify 
whether the noise is still 
present. Yes
Go to step 6.
No Data error issue resolved by 
Disk Utility. Return system to 
user. H06
4.  Erase disk and reinstall Mac OS 
using Install DVD. Verify that 
installation process completes.  
Note: Make sure data has been 
backed up before erasing hard 
drive. Yes
Go to step 3.
No Replace hard drive.  
Go to step 5. H06
5.   With replacement hard drive...
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