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Old Oct 26, 2014, 05:21 PM   #26
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Join Date: Dec 2010
Location: UK
I had a similar issue on my Late 2012 iMac. The only difference was I only had a single line and the line ran horizontally and would appear, disappear at random intervals. It was only really visible on dark backgrounds.

I have Apple Care and it was the LCD panel that was at fault.

Here's a video clip I took showing the issue:

iMac Late 2012, 2.9GHz Quad-Core Intel Core i5, 1TB Fusion Drive, NVIDIAGeFrc GTX660M 512M GDDR5, 24GB ram
iPhone 6 Plus 64GB Space Grey, iPad Air 32GB

Last edited by Fatboy71; Oct 26, 2014 at 05:26 PM.
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Old Oct 26, 2014, 07:16 PM   #27
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Join Date: Dec 2013
Smile Vertical lines


Good to know that you were still under Apple Care.

The lines on my monitor are grouped in fours app. 1/4" apart in each group; each line smaller than yours... maybe 1/32"... extending in the groups across the display. Now that I'm aware that it's a constant problem, my eyes are drawn to it, but it's not an emergency fix for me unless it becomes worse. I look forward to the retina display on the new iMac.

27" 2010 iMac, 2.93 Ghz, i7 core - 8 GB RAM, 1 TB HD
iPhone 5s, iPhone 4, iTouch 4, iPad 2
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Old Oct 27, 2014, 02:54 PM   #28
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Join Date: Oct 2014

A mid 2010 iMac I bought this summer has this issue. I actually thought it was normal until I saw this thread. The LCD looks to be at fault all right. I wonder what could be causing it...
27'' Retina iMac, 4.0 GHz Quad i7, 512 GB SSD, 24 GB RAM
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Old Oct 28, 2014, 01:40 PM   #29
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I have started having the same problem with my 27 inch late 2009 i7. Does anyone know how much this would cost to fix and if it is worth it? I have been considering upgrading and I usually give my prior computer to my wife when I do, but I don't want to give her a problem computer.

I have to say that I am dissapointed. This is my first Mac, and when I bought it my biggest concern was that if a component goes bad it isn't easily replaced or fixed. All of my previous PCs have run without any problem (other than operating system issues) much longer. My sister in law is currently using my old Dell that is probably about 12 years old now and the hardware has not had a hint of a problem. My wife's computer is a Dell that is over 8 years old and runs great (again, except for Windows OS quirks from time to time). I purchased the iMac a little less than 4 years ago and I started having this issue about 6 months after Apple Care expired. Hmmm.
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