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iMac (24-inch Mid 2007) Take Apart — Symptom Charts 215
persists.
LED # 4 is LED # 4 is O: The video card and logic board are unable to communicate to
generate video. Replace the video card and install the iMac Graphics Firmware Update.. If
the issue persists, replace the LCD display.
Video Corruption on the Panel
Make sure all software updates have been applied to the computer. Refer to 1. KBase article
303903, Intel-based iMac: Installing available updates , and to Apple Downloads for all
available updates for the iMac (Mid 2007) model of computers.
Connect an external monitor to the mini-2. DVI port. Does the external display exhibit the same
color tinting?
Yes: Replace the video card and install the iMac Graphics Firmware Update.
No: Check the LVDS cable connections. If connected properly and the same color tinting
persists, replace the LVDS cable. Does color tinting persist after changing the LVDS cable?
Yes: Replace the LCD display panel.
No: Problem solved. Restart the computer from the Apple menu and make sure the
computer display is functioning correctly.
Display is tinted another color.
The iMac (Mid 2007) computer has a tinted glass panel covering the display, giving it a new 1.
look from previous models. Make sure this not what the customer is referring to.
Reset the parameter RAM. Press the Command-Option-P-R keys. When you keep all the keys 2.
held down, you will hear the startup chime over and over again (about every ten seconds)
until you let go. After you hear the second chime, you can let go of the keys.
Does the computer display video after successfully resetting the computer’s PRAM?
Yes: Problem resolved. Restart the computer from the Apple menu and make sure the
computer display is no longer tinted another color.
No: Continue to the next step.
Connect an external monitor to the mini-3. DVI port. Does the external display exhibit the same
color tinting?
Yes: Replace the video card and install the iMac Graphics Firmware Update
No: Check the LVDS cable connections. If connected properly and the same color tinting
persists, replace the LVDS cable. Does color tinting persist after changing the LVDS cable?
Yes: Replace the LCD display panel.
No: Problem solved. Restart the computer from the Apple menu and make sure the
computer display is no longer tinted another color.
System Shuts Down
Unexpected Shutdown or Freezes
If the computer freezes or you experience unexpected shutdowns while using your 1.