Not saying this will help directly but:
As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
- Shut down the computer.
- Unplug the computer's power cord and ALL peripherals.
- Wait 15 seconds.
- Attach the computers power cable.
- Wait another 5 seconds and press the power button to turn on the computer.
- It is the 5 second timing that initiates the reset.
Here is a link to a Widget to monitor your temps and other operations:
Great picture by the way
It seems that this is a very common problem for the 2007 iMacs. I found out that Apple was replacing the LCD Screens in these iMacs, just last year (for FREE). I am wondering if I can even get my iMac fixed.
I found a disuccsion regarding the verrticle lines on the 2007 iMac at the MacRumors web site:
I need to go to the local Apple store and find out if I can get someone to help me.
I'm very sorry for my bad english.
I have the exactly same problem. So I completly open up the display found 2 problem. The first one are the backlights exausted. The second are scratches on the plastic panel where the backlights are located. This scratches cause the vertical lines. New backlights probably will eliminate the vertical lines, but when the lights intensity decrease you will have again the vertical lines.