Apple imac 20 inch late 2006 User Manual

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 171
Optical disc constantly ejects
Disconnect all peripheral devices, especially the mouse in cases where the disc is constantly 
1.  
ejecting. Retest. If the issue is resolved, reconnect peripherals one-at-a-time until faulty 
peripheral is identified.
Try cleaning the disc. If the disc is dirty or scratched, it may not mount.  
2.  
Is the issue resolved? 
Yes: Problem solved.  
No: Try a different disc. If the issue persists, go on to the next...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 17 2
Fan Sound
Fans running at full speed after the computer turns on
The customer may have entered a diagnostic mode that causes the fans to run at full speed.* 
Restarting the system will not restore normal fan operation. To solve the problem, the user or 
technician should do the following:Shut down the system.
1.  
Disconnect the power cord and wait 15 seconds.
2.  
Reconnect the power cord and wait 5 seconds.
3. 
Power on the system.
4....

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 17 3
The sound is always present: The normal functioning of the hard drive and optical drive will 
generate additional whirring and scratching noises that may be audible. Check whether this 
sound is related to one of the components. Go to step 4.
 
 
The sound varies: Under normal conditions rotating blowers will make a slight hum that 
varies in relationship with their rotational speed and the amount of air that they are moving. 
Let’s see if...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 174
article 152349, “Replacing a disk before it fails.”
Shut down the computer, remove the power cord and any other connected cables, and 
5. 
remove the access door, front bezel, and EMI shield.  
Stand up the computer, plug it in, and start it up by pressing the external power button.  
 
As the machine starts up, listen carefully to each of the three fans, and see if you can locate 
the fan from which the objectionable ticking, whistling, or...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 17 5
Determine that this noise is related to the computer by removing and shutting down all 
2.  
other devices in the vicinity of the computer that could be causing a sound.
Eject any media inserted into the optical drive. The optical drive will make a variety of normal 
3. 
sounds when accessing the optical media.
Quit all applications and test the computer again. Processor intensive applications may cause 
4.  
the fans to run at a higher RPM...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 17 6
AirPort
Not able to connect wirelessly with AirPort
1. From the Apple menu, choose About this Mac. 
2- Click on More Info. System Profiler should open. 
3- In System Profiler, in the column on the left, look under Network for a line called “AirPort Card”. 
Select that line. 
4- Does the section to the right say “No Information Found”? Yes: The computer doesn’t realize it has an AirPort card installed. Go to step. 5 
No: The iMac recognizes...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 17 7
Bluetooth
Bluetooth devices won’t sync with my computer
1. Make sure the computer has a Bluetooth board installed.  Open System Preferences (from the 
Apple menu, choose System Preferences) and verify that “Bluetooth” appears in the Hardware 
section of the window.
2. Locate the Bluetooth board inside the computer. Reseat the Bluetooth board and the 
Bluetooth antenna.
3 Turn on Bluetooth.  In System Preferences, click Bluetooth and then...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 17 8
IR Remote
Remote won’t communicate with system applications such as iTunes or iPhoto, or with the 
optical drive.
Make sure of the following when using the Apple Remote:  You are within 30 feet of the front of the computer.
• 
You have an unobstructed line-of-sight to the front of the computer.
• 
You are pointing the lens end of the Apple Remote directly at the front of the computer.
• 
The computer is powered on and awake.
• 
The “Disable...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 17 9
IR Sensor/Receiver
Supported applications do not respond to input from the remote control.
Perform the checks above under “IR Remote” to verify that the Apple Remote is functioning 
1.  
correctly, and retest. Do supported applications now respond to input from the IR remote? 
Yes: Problem resolved.  
No: Go to the next step.
Verify that the IR Sensor can be seen in the Apple System Profiler. Open the Apple System 
2.  
Profiler and click on...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 180
Built-in iSight Camera
The built-in camera is not recognized.
Boot the iMac to the desktop and launch iChat AV. 
1.   Note: You do not need to be connected 
to a network to use iChat AV to troubleshoot. Verify that the correct versions of Mac OS X 
and iChat AV are installed. Reinstall or update software as needed. 
Open the iChat AV preferences and click on the ‘Video’ icon. Verify whether the camera is 
2.  
recognized by the iChat AV...