5 Replies Latest reply: Feb 25, 2013 3:33 AM by macfranco
Carlheanerd Level 1 (0 points)

Hey all.


I am the user of a 20" mid-2007 iMac, 2.4 GHz model. I am aware the 20" displays from this generation are lower-quality TFT-based displays and don't have the newer IPS tech found on the upper end models, however, my problem seems a little different. I have learned to live with the poor viewing angles, however, I have a new issues. My backlight appears to be bleeding through my display, making vertical stripes. For the full effect, see my picture here: http://i.imgur.com/nrhEa.jpg


See the vertical stripes? Is this a common issue?





iMac 7,1, Mac OS X (10.6.5), 20" Screen, 2.4GHz C2D, ATi Radeon 2600 HD Pro, 3GB RAM, 320 GB
  • RRFS Level 5 (4,490 points)

    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

  • Carlheanerd Level 1 (0 points)

    I have taken shots comparing my temps while under load and while resting. They are in ºF.




    Under high load:


  • brus Level 1 (0 points)

    I have the exact same model with the exact same vertical stripes. I have had the stripes for a couple of years actually and i have tried to open it up and clean it several times but with no success unfortunately.Sorry i don't have a solution but if someone does that would be amazing.

  • ticzon Level 1 (5 points)

    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.



  • macfranco Level 1 (0 points)

    Hi all,

    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.