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  1. #1
    Screen darker at the top

    Member Since
    Jun 13, 2011
    Posts
    15
    Screen darker at the top
    Using an iMac with 2.66 GHz Intel Core 2 Duo and OS 10.6.7; bought in 2008

    Today when I turned the 'puter on, the top of the screen has darkened to about a third of the way down. Still able to see everything but the top is definitely darker than the bottom; anything I can do to adjust this or is the screen going out?

  2. #2
    Screen darker at the top
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    45,271
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    Run this test for us: Take a screenshot of your desktop. Does the screenshot show the same thing?

    If the screenshot shows the same, it's probably graphics related. If it doesn't, it's likely a display defect.

    Post back results.

  3. #3
    Screen darker at the top

    Member Since
    Jun 13, 2011
    Posts
    15
    Screenshot looks the same as the desktop.

  4. #4
    Screen darker at the top
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    45,271
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    If the screenshot shows the same thing as you're seeing on the desktop, it's not the display. That tells us it has something to do with the graphics processor. The GPU on your model iMac is mounted to the logic board (motherboard) and if it is somehow acting up or defective, that would mean a logic board swap out.

    Try starting your iMac in Safe Boot mode. (hold down the shift key as soon as you hear the POST chime) Is it doing the same thing in Safe Boot mode?

    Also, is your iMac covered by Apple care? If it is, make an appointment with Apple and have them look at it.

  5. #5
    Screen darker at the top

    Member Since
    Jun 13, 2011
    Posts
    15
    The screen looks the same in Safe Boot mode; I think my Apple Care has run out; guess I'll have to take it in any way. Thanks for your help!

  6. #6
    Screen darker at the top
    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    28,480
    Specs:
    iMac late 2007 10.11.b4, iMac 2008 10.10.5, Macbook2007 10.7.5, Mac Mini 10.7.5, iPhone 3GS Note 8!!
    Just a quick heads up. My imac G5 iSight did that but toward the bottom. Difference is I had been inside fixing another issue with the Hard Drive.

    One of the plugs from the LCD to the Bottom Inverter board pulled out a bit when I had lifted the display a bit to route some wires. So the bottom of the LCD was not being lit! Pushed it back in and like new!

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