Why am I seeing a thin white horizontal line on my 27" iMac?

Why am I seeing a thin white horizontal line across the center of my monito?

Obvious suspects are the monitor itself or the video card.
Boot in safe mode and see if the line is still there (just to see what happens when quarts extreme isn't running).

Similar Messages

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    I noticed that when I open two windoes (say Safari and Trash can) and minimize both windows so they go on the dock, when I do the swip down gesture with 3 fingers (App Expose´) there is a thin white horizontal line at the bottom of the screen. Does it happen to every macbook pro out there?  Is this normal?  Hope it's not a display screen problem...

    You would have to have multiple pages of the app minimized.
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  • Thin white horizontal line over top of photo & top of QT clip?

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  • Why do I have white horizontal lines on my Macbook Pro Retina?

    When I am using my 15" Macbook Pro, there are often white horizontal lines that run across the screen. It usually happens when I am watching a video, typing, scrolling or just sitting on the desktop. There are days where the screen is perfect and there are no problems; there are also days where it happens so frequently that some videos becomes unwatchable due to the distracting lines flickering and flashing on the screen. They don't stay all the time but I'd love to know what the problem actually is. Thank you for reading, and please help me out.

    Hi there JohnRendleman,
    I would recommend taking a look at the troubleshooting steps found in the article below.
    Apple computers: Troubleshooting issues with video on internal or external displays
    http://support.apple.com/kb/HT1573
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  • What is the white horizontal line and red vertical line on my brand new ipad mini?

    Bought a brand new ipad mini 2 for my sons Christmas, took it out the box and it was during the set up process, ie entering his iTunes and icloud account, a white horizontal line and a red vertical line appeared on the screen and is there all the time now.  Have tried switching off and on and resetting, but it is still there.  Any ideas??

    Hi Tolmivooz,
    So the lines didn't appear until you were into the setup?
    Does the orientation of the lines change when you rotate the screen?
    Thanks for trying the restart and reset. Please see if a restore helps.
    Get help with the screen on your iPhone, iPad, or iPod touch - Apple Support
    If you see lines, missing sections, discoloration, or poor image quality
    Try to restart your device. If you can't restart, reset your device.
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  • My iPhone 3g has 2 white horizontal lines i don't know where did it came from. I turn it off then on but its still there. the lines spreads everyday. I dont know how to fix it. need some help guys.

    my iPhone 3g has 2 white horizontal lines i don't know where did it came from. I turn it off then on but its still there. the lines spreads everyday. I dont know how to fix it. need some help guys.

    If you take a screenshot (Press the home button and Lock button at the same time), does it appear on the screenshot? Zoom in on the screenshot and see if it's still there.
    If not, then your display is failing. I would recommend taking it to an Apple Store if you can, if you can't then to an authorised Apple reseller.
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  • White horizontal lines on 15" flat panel G4

    I have white horizontal lines running across the screen of my 15" flat panel G4 i-mac (2003).
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    Hi Jennifer,
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  • White horizontal line on macbook pro retina display

    When I scroll through photos, sometimes a white horizontal line will span the screen for a short time. It will span the whole screen for less than a fraction of a second so it was difficult to take a photo of it. I managed to do it but here the line is only halfway across the photo I was looking at.
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    When printing a solid magenta there are white horizontal lines. 
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    Please read this post then provide some details.  What printer model?  Are there any error messages on the printer or computer screen?  Are the lines spaced regurlarily or randomly?
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    I am not an employee of HP, I am a volunteer posting here on my own time.
    If your problem is solved please click the "Accept as Solution" button ------------V
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  • A red horizontal line appear on my imac

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    Contact Apple Service, iMac Service or Apple's Express Lane. Do note that if you have AppleCare's protection plan and you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine.

  • My iphone 5 stopped working. I only see a thin white line on the screen

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    Hi susiesunshine,
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  • Thin black horizontal lines on 24" iMac screen/transparent dock icons

    I have a 24" 3.06 GHz iMac (purchased in August 2008) and noticed after about a half hour of running basic programs (Mail, iTunes, Firefox) I start to get horizontal lines near the top and bottom of my screen. Then if I watch a full screen video I can see my dock icons look almost transparent through the video. I took my iMac into the Apple store last month and told them about it and they kept it for 3 days and ran their "tests" and stressed the computer out to get it to do it for them but they couldn't replicate the problem. They suggested that it might be my cordless phone is too close to the screen and the frequency of the cordless phone could be causing the problem but I tried moving the phone and it still does it. When the display is off for hours and I turn it back on the lines are not there, but once I have it on for a half hour they come back and don't go away until I power off or sleep the display. I've attached a few pics of what I'm experiencing. Thank you very much.
    http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0091.jpg
    http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0092.jpg
    http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0090.jpg

    Since the Apple Store folks could not replicate the problem, you may want to consider a cause that is part of your particular environment.
    For example, if you use a power strip (surge suppressor), what else is connected to the same power strip? Is it possible that you may have too many power-hungry devices connected to the same single wall outlet, and the iMac is not getting sufficient power? Or maybe it's some electrical interference with another device on the same circuit? As a test, try disconnecting everything else, and see if the problem recurs, or connect the iMac directly to a wall outlet by itself to see if the problem recurs.
    Try moving the iMac to a different location in your home and running it to see if the problem recurs.

  • Why do i have a grey thick horizontal line on the bottom of my screen imac

    hello
         I been having a problem with my iMac 21.5 inch mid 2011 since this monday January 7,2014. Theres a grey and some times black thick horizontal line at the bottom of the screen, I cant see my programs at the bottom of the screen. First its black then turns into grey and it starts flickering and then it stops flickering and it wont go unless I turn off my mac or put it to sleep, and then like an hour it comes back again. please could you help me Thank you.

    Hello Armando
    Check out the article below for troubleshooting your issue with the display. There are a few things that can be done, like changing the resolution of the display and also to reset the NVRAM to see if that resolves that for you.
    Apple computers: Troubleshooting issues with video on internal or external displays
    http://support.apple.com/kb/ht1573
    Regards,
    -Norm G.

  • Why am I seeing REPLY_SUBJECT_PREFIX before the subject line of some of my emails?

    Lately, on my iPhone 5, I've been seeing REPLY_SUBJECT_PREFIX before the subject line of some (but not all) of my emails.
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    Well, I'm still not sure why it happened, but if you're reading this and you've got a similar problem, the thing to do is to reset the iPhone (hold home button and power button (the one at the top) down at the same time for several seconds). That seems to have fixed the problem.

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