If anyone else is seeing this and took their machine in to Apple as a result, would love to hear how they resolved it. So I'll give some of those a go when I have a chance this weekend. He also offered some ideas straight out of Apple's display problem flowchart (connecting an external display, using the machine as a slave display to my MacBook Pro, seeing if the lines appear or disappear during different parts of the boot process, etc.) to narrow it down to different hardware subsystems. ![]() He had no "ah, that's definitely " ideas, saying it could be anything as simple as a pinched display cable (how would that happen in an iMac?) to a failing 4850 to a failing screen. I e-mailed all of this to a friend who used to be a lead Genius. But at least now I feel like I have a baseline and can monitor them. I really can't say whether the lines are getting any worse, or even how long they've been there as I only noticed them by accident earlier today. Very helpful! My iMac gets used similarly: It's my primary work machine, turned on 24/7 and in active use easily 9-10 hours a day during the week. Honestly, I don't feel compelled to do anything about it since they're only marginally visible on a normal screen full of different objects, but if they're an early warning sign of failure, I want to be prepared (HINT TO APPLE: UPDATE THE DAMN iMACS, PLEASE) If I focus on any one spot on one of the lines, it appears to be moving upwards - sort of like the "marching ants" around a selection area in Photoshop, but moving much faster.Īny ideas what this may be? Sign of age? Imminent failure? Anyone seen this before? The lines themselves are "moving" for lack of a better word: There's a "chase" or a "pulse" to them. On a white or very light background, they disappear entirely. At normal working distance they are not visible, or only faintly visible if I really focus on a solid dark area. ![]() solid black or dark gray), the more visible they are, although they're still only noticeable if I put my nose up close to the screen. The darker and more even the background (e.g. On my 27" 2009 iMac screen, I've started to notice thin, faint, vertical lines - evenly spaced. ![]() You know what my favorite problems are? The ones that are nearly impossible to describe.
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