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Apple imac 17 inch late 2006 cd User Manual

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Page 121

 Service Source
© 2006 Apple Computer, Inc. All rights reserved.
Troubleshooting
iMac (17-inch Mid 2006) and iMac (17-inch Late 2006 CD) 

Page 122

iMac (17-inch Mid 2006/Late 2006 CD) Troubleshooting — General Info 122
  
General Information
Serial Number
iMac serial number is located on the bottom of the computer stand.
Power On Self Test (POST)
Intel-based Mac computers rely on a combination of tones and blinking LEDs to display Power 
On Self Test (POST ) error codes.
If the computer detects out-of-specification or no SDRAM or the RAM installed does not 
meet the appropriate specifications, the screen will remain black but the power LED on the...

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iMac (17-inch Mid 2006/Late 2006 CD) Troubleshooting — General Info 123
DDR Memory
The iMac computer has two SDRAM slots in the bottom of the computer. The iMac ships from the 
factory with at least 512 MB of DDR2 SDRAM, installed as a 256 MB DIMM in the top slot and a 
256 MB DIMM in the bottom slot. ( The computer may come with more RAM, depending on how 
the computer was ordered from Apple.)
Although you can install a single SO-DIMM, it is recommended that memory be installed in 
matched pairs for...

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iMac (17-inch Mid 2006/Late 2006 CD) Troubleshooting — General Info 124
How to Reset the System Management Controller (SMC)
The System Management Controller (SMC) is a chip on the logic board that controls all power 
functions for your computer. If your computer is experiencing any power issue, resetting the SMC 
may resolve it. The SMC controls several functions, including:
Telling the computer when to turn on, turn off, sleep, wake, idle, and so forth.
Handling system resets from various commands....

Page 125

iMac (17-inch Mid 2006/Late 2006 CD) Troubleshooting — General Info 12
Diagnostic LEDs
The iMac has three built-in diagnostic LEDs and a front LED on the main logic board (shown 
below) that can help you to troubleshoot the computer. 
To Access the LEDs:
Follow the take apart instructions to remove the RAM access door, front bezel, and lower 
EMI shield.
Locate the SO-DIMM slot and LVDS video connector. The three troubleshooting LEDs 1, 2, 
and 3 are located to the right of the LVDS cable...

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iMac (17-inch Mid 2006/Late 2006 CD) Troubleshooting — General Info 12
 LED #1 
Indicates that the trickle voltage from the power supply has been detected by the main 
logic board. This LED will remain ON whenever the iMac (Mid 2006 17-inch) is connected to 
a working AC power source. The LED will remain on even when the computer has been shut 
down or put to sleep. The LED will turn off only if the AC power source is disconnected or the 
power supply is faulty.
LED #2
Indicates that the main logic...

Page 127

iMac (17-inch (Mid 2006/Late 2006 CD) Troubleshooting — Symptom Charts 12
Symptom Charts
How to Use the Symptom Charts
The Symptom Charts included in this chapter will help you diagnose specific symptoms related 
to the product. Because cures are listed on the charts in the order of most likely solution, try 
the cures in the order presented. Verify whether or not the product continues to exhibit the 
symptom. If the symptom persists, try the next cure. 
Note:  If a cure instructs you to replace a...

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iMac (17-inch (Mid 2006/Late 2006 CD) Troubleshooting — Symptom Charts 12
Power Issues
No Power 
The iMac will not turn on. The display remains black and there are no sounds from the fans or 
drives.
1. Verify the power outlet is good. Plug a different device into the socket to ensure there is power, 
or plug the iMac into another outlet. Does the iMac power on now?
Yes: Resolved. Bad outlet.
No: Go on to the next step.
2. Check the power cord. Use a known good power cord. Does the iMac power on...

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iMac (17-inch (Mid 2006/Late 2006 CD) Troubleshooting — Symptom Charts 12
8.  Press the power button. Check to see if LED # 2 comes On, comes on momentarily, or stays Off.
LED # 2 is On: The Power Supply is functioning. Go on to the next step.
LED # 2 comes on momentarily or stays Off: Replace the Power Supply.
9. At this point in the Power On process, you should hear a boot chime and see the front LED on 
the computer light up. When the main logic board and LCD panel communicate to deliver video,...

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iMac (17-inch (Mid 2006/Late 2006 CD) Troubleshooting — Symptom Charts 130
No Video
No Video, No Boot Chime, White LED ON (Symptom 1)
The iMac will turn on (indicated by the front LED ON), but there is NO boot chime and No Video 
on the display. The faint sound of the fans, hard drive, and optical drive may  also be heard.
1. Follow instructions in the “General Information” chapter to reset the SMC. Does the computer 
display video after successfully resetting the SMC?
Yes: Problem solved.
No: Continue...
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