Apple imac 20 inch late 2006 User Manual

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 161
 
 
 
  

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 162
Open the Energy Saver System Preferences and temporarily set the display to sleep after 
1.  
one minute. Set the computer to sleep after ten minutes. Once the Energy Saver preferences 
have been set, wait for the display to go to sleep.
Wake the display from sleep and observe the display. Does the image on the display 
2.  
shimmer or fill with horizontal or vertical lines when waking from sleep?
Ye s : Replace the main logic board
No :...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 16 3
Display
The display does not remain in its intended position when tilted.
The iMac (20-inch Late 2006) display should move and stay in an intended position for it’s range 
of motion.Verify that the display is not keeping position.
1.  
Verify that the computer stand is not propped up in the rear (resting on its power cord, for 
2.  
example).
Verify that the work surface is also flat as in relation to the floor. A tilted work surface (such...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 16 4
When displaying a single color over the screen area, the LCD panel shows one or more pixels 
that are not properly lit
Active-matrix LCD technology uses rows and columns of addressable locations (pixels) that 
render text and images on screen. Each pixel location has three separate subpixels (red, green, 
and blue) that allow the image to be rendered in full color. Each subpixel has a corresponding 
transistor responsible for turning the...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 165
Hard Drive
Flashing question mark, or an alternating question mark and Mac OS (face or a 
folder)
Note: When troubleshooting hard drive problems it is a good idea, if possible, to back up any 
important data. Some troubleshooting steps may require erasing the contents of the hard drive.Boot from the system CD that came with the computer, and open Disk Utility. Does the hard 
1.  
drive show in Disk Utility? 
Yes: Run Repair Disk and Repair...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 166
System hangs during normal startup process
Boot from the system CD that came with the computer. Use Disk Utility to verify the hard 
1.  
drive.
Using Disk Utility, reformat the hard drive.
2.  
Check all cable connections to and from the hard drive.
3. 
Replace the hard drive data cable.
4.  
Replace the hard drive.
5. 
Replace the logic board.
6.   

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 16 7
Optical Drive 
CDs or DVDs don’t show up on the Desktop.
Select Preferences from the Finder menu and make sure the option to show CDs, DVDs and 
1.  
iPods is checked: in the General window as shown below.   

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 168
Select System Preferences from the Apple menu and open the CDs & DVDs preferences 
2.  
window. Make sure that audio CDs are set to launch iTunes and movie DVDs set to launch 
DVD Player when those media are inserted, as shown below.  
Check that the drive can read discs normally. Insert an audio CD and check whether it shows 
3. 
up on your desktop or launches iTunes.  
Does the audio CD mount on the desktop or in iTunes? 
Yes: The drive...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 16 9
The computer won’t burn discs.
Check whether the drive can read CDs and DVDs normally. Perform the steps above for “CDs 
1.  
or DVDs don’t show up on the Desktop.”
Try a test burn by creating a Burn Folder, as follows.  
2.  
• In the Finder, choose “New Burn Folder” from the File menu.  
 
• Open the Burn Folder, drag an item inside for testing, and click “Burn” in the upper right 
corner of the window.  
  
• When prompted, insert a blank...

iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 170
No: Replace the optical drive. Does it burn correctly now? 
 
Yes: Problem solved.  
  No: Replace the logic board.
Discs won’t insert.
Is there a disc already in the drive? 
1.  
Yes: Eject the disc before inserting another. Refer to Knowledge Base article 106752, 
“Macintosh: How to Eject a Disc When Other Options Do Not Work”. If none of these options 
will eject the disc, you may have to disassemble the drive to recover the disc. See...