Visible square outline on iMac 27" display

Discussion in 'Mac Basics and Help' started by stevenknight, Aug 13, 2011.

  1. stevenknight macrumors newbie

    Aug 13, 2011
    This is a tricky one to explain but here goes. I got my 27" iMac a few weeks ago - love it. However, there's one small issue. About a week after I bought it, I noticed that there's an outline of a square on one half of the display - it's very faint but it's definitely there. It can be seen against any background ranging from white to dark grey and can be seen during videos and games if you focus on the area around it.

    I tried to take a picture of what I can see and have attached it and tried to outline the issue (it was taken on my iPhone 4 so apologises for the poor quality). It gets even more curious when I found out that this outline is in the same place and size for the Google Chrome app to fit perfectly inside of it and I think the plug may have come out while this app was displayed, but I doubt that would cause this issue.

    I have tried Googling this issue but cannot find a single issue to match - I don't really want to go to Apple and explain the issue because they messed up my iPad 2 replacement (even though I now have Apple Care). This issue doesn't ruin my latest Apple purchase because it's a beautiful thing, it would just be nice to know the cause of this issue and if there's a solution.

    I would appreciate any advice, help or history on this issue. Thank you, Steven.

    iMac Specifications
    • 27" iMac (Mid 2011)
    • Mac OS X Lion (Pre-installed with Snow Leopard)
    • 3.1Ghz QuadCore CPU
    • 4GB DDR3 RAM
    • AMD Radeon HD 6970M (1GB)
    • 1TB HD

    Edit: Imbedding the image stretched the page, here's a link.
  2. johto macrumors 6502


    Jan 15, 2008
    It probably is just a "ghost" image from your app you use a lot on the same place on your screen. I bet its a web browser(edit: ah your chrome..didnt even need to read your whole post). Dont worry, this "burn" effect can be seen also on a 2008 imac model. Its not permanent. I goes a way when your display has displayed something else for a time, or you have your display shut down for a period of time.

    See the wiki:
  3. stevenknight thread starter macrumors newbie

    Aug 13, 2011
    Ah didn't know that I could cause a ghosting image, thanks for your help. Will move the Chrome app to somewhere else and see if it vanishes within time, thank you, Steven.

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