Thin Horizontal Lines on 27" iMac display, 0.5 inches thick covering dock

About a week ago I started to notice thin horizontal lines running across the bottom of my 27" iMac Core Duo screen. A ribbon of thin lines, about 1/2 inch thick, covering the bottom portion of the dock. The overall ribbon of lines is translucent, a bit animated shortly after boot-up but they become pretty fixed and static after a few minutes so I can still see and manipulate the dock, and I have not noticed any malfunctioning of iMac systems. All applications are working fine as always. For months I have been downloading all the software, operating system and firmware updates, without a problem. I have no other software or firmware updates that I can download. Like other iMac 27" users, I too suffered thru a period this past winter when the display screen intermittently flickered or blacked out or worse, but those problems were immediately fixed by Apple's relevant display firmware updates that came out in December and January. I recently called AppleCare and they ran thru a diagnostic test with me over the phone, but they can't diagnose the underlying problem. Next step requires that I lug the computer to a nearby Apple Store for a "Genius Bar" appointment. Will do that soon. But in meantime, has anyone else with an iMac 27" display experienced this latest problem that I'm having despite having downloaded all available software and firmware updates? Thanks, in advance, for whatever insights and helpful advice that you can share.

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hi kbrunk,
Welcome to the Lenovo Forums and sorry to hear about your trouble.
Horizontal lines are commonly caused by an imminent failure on the LCD (either the LCD panel or the LCD cable) or the GPU. To identify which component is failing, the unit must be connected to an external display. If the display is fine then the culprit is the LCD cable, otherwise, it's the GPU (which is integrated to the CPU (CPU is soldered to the motherboard)).
In the event that the problem is with the LCD cable, you can opt to:
1. Contact lenovo for service
2. Have the machine serviced at a professional computer repair center (if they don't have the parts for the repair, you can purchase it online (like this item).
If it's not convenient to have the unit serviced at the moment (ie. need it for an upcomming exam, thesis, etc.), the computer can still be used if the horizontal line is still bearable but I recommend you get it serviced ASAP.
Regards
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HT2807 why is there a horizontal line across my imac screen?

why is there a horizontal line across my imac screen?

Not sure exactly which model your iMac is..?
see > How to identify iMac models
Sadly display lines generally indicate a problem with either the Display or the Graphic's Chip.
To check, take a screen shot of the display using the (Command Shift 3) keys and open it.
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If the line shows up in a screen shot, then it would most likely indicate a Graphic's Ciip problem.

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http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0092.jpg
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It seems obvious, but please don't contravene the Terms of Use for this forum. If you want to complain to Apple, please do it elsewhere - locked posts will get us nowhere

n2o2,
I don't know what let you think that you will eventually receive an AluBook without stripe : Apple Care let you think that ???????.
I have been reading the stripes topics each day since I ordered my new powerbook, late october. I did not see one single post proving that a "free line" 15" powerbook does exist.
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Thank you for using Apple Support Communities.
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Thin Horizontal Lines on 27" iMac display, 0.5 inches thick covering dock

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