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.