Faint horizontal lines accross iMac lcd

Had a 24" iMac that developed faint horizontal lines across the lcd that got progressively darker the longer the computer was on. Had the lcd replaced by Apple twice, but after a couple of weeks the problem returned. They gave me a new iMac, but a month in I have the same problem with the new machine. Has anyone encountered this problem? Is it an inherent issue with iMac lcds or is it something external affecting my machine? And I'm not talking poltergeist. Help, want this fixed.

We have a 20" imac Core Duo that was purchased summer 2006 - then about 5 or 6 months ago, it started developing horizontal lines across applications (Safari, Mail, etc) and the desktop - sometimes they would go away, sometimes not... I thought is was some video driver conflicting, upgraded to snow leopard, went to the genius bar, etc... but lately it got worse to the point that it started locking up every day... this after going weeks or months without a reboot and over 3 years having almost zero crashes...
I read in a forum where the video chip (GPU - graphics processing unit) was heat sensitive and thought that after 3+ years, maybe it was dusty in there... I installed the iStat widget to monitor the temp of the GPU and installed a fan control (software) where you can increase the minimum speed of the hard drive fan (allegedly located above the GPU). I also put the end of the vacuum on the fan vent just above where the power cord goes into the back of the monitor and let it run for a while hoping to clean things out...
5 days later - zero display issues, zero hangs and zero crashes - and the GPU runs an average of 25 degrees cooler than before. This after a genius bar guy told me that it probably needs a new display board. Good Luck!

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-D
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Message Edited by Darren on 10-13-2008 11:28 AM
Darren Nattinger, CLA
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Your graphic card is damaged. Unfortunately, the only thing you can do is to take the Mac to an Apple Store or reseller to get the computer repaired.
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Take it to an Apple store genius bar and have it tested...a year ago there were several posts about vertical lines, sometimes blue, sometimes yellow, sometimes pink and mixtures...in every case it turned out to be due to failure of a graphics module chip. The Apple techs were able to replace the chip (the user cannot even think of doing that) for a price significantly less than a new logic board.
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I have the iMac G5 (NO iSight) and some months ago I discovered some random horizontal lines that went through the whole display up or down. They are not there the whole time, sometimes when I work with Aperture or even iPhoto or Safari the lines start to appear, or sometimes when I turn on the computer. I don't think they are linked with temperature, but I do think they are related to the processor use, as when they appear I hear the fans inside, which means the more of the processor is being used. I've also tried the iMac on different homes, so it's not energy related. I got the iMac to an Apple Authorized Retailer and they changed the logic board under the extended repair for the iMac G5, but that was no luck. The lines are still here, and they don't know what is causing them. Anyone knows what I could do to get the display fixed? Any part inside? Thanks, they are very annoying.

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Please try contacting Apple in the United States. I can't, I don't live in the US. Any ideas of solving this (maybe directly from Apple) would be great. Thanks!

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I have the same problems, and did some googling. I found out the white 24 inch (late 2006 to early 2007) Imacs have a video card problem. The soldering on these units tend to go bad, the card is the Nvidia GeForce 7300 GT.
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Who else has faint horizontal lines in their 17" Display? Look closely!

Description: Every other horizontal pixel row appears brighter than the alternate, creating a scan-line style effect that also contributes to the washing out of the display. In seemingly random "luck of the draw" machines, lines can either be highly visible or not be present at all.
In displays where it is faint, you may not notice, but once you become aware of it is a real problem if you work closely with your computer, and graphics.
This appears to be the same issue that has been widely reported in the past with Macbook Air computers.
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Thanks
Both pictures taken in upper-right corner of screen with standard Leopard desktop picture.
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007OHMSS
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So I went to the Genius Bar with the history as outlined above. We had to watch my display for almost 10 minutes (while he checked various system stuff) before it would perform. But then it cut loose with a very convincing display of the faint, fuzzy groups of yellow lines moving slowly up the screen.
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When scrolling vertically there is an horizontal line which causes distorsion of the screen. I do not have noticed such concern on my iMac or on my macbook. What happen with the macpro ?

When scrolling vertically there is an horizontal line which causes distorsion of the screen. I do not have noticed such concern on my iMac or on my macbook. What happen with the macpro ?

MacPro bought in 2010
MacBook Pro
MacBookPro7,1
Intel Core 2 Duo
2,4 GHz
Nombre de processeurs :          1
Nombre total de cœurs :          2
Cache de niveau 2 :          3 Mo
Mémoire :          4 Go
Vitesse du bus :          1,07 GHz
Version de la ROM de démarrage :          MBP71.0039.B0B
Version SMC (système) :          1.62f6
Numéro de série (système) :          W804853GATP
UUID du matériel :          716CB476-983B-5C43-B363-988FB608C01C
Capteur de mouvement brusque
État :          Activé
System:
Mac OS X 10.6.7 (10J869)
Darwin 10.7.0
Video DIsplay Card
NVIDIA GeForce 320M :
Jeu de composants :          NVIDIA GeForce 320M
Type :          Processeur graphique (GPU)
Bus :          PCI
VRAM (totale) :          256 Mo
Fournisseur :          NVIDIA (0x10de)
Identifiant du périphérique :          0x08a0
Identifiant de révision :          0x00a2
Révision de la ROM :          3533
Moniteurs :
LCD couleur :
Résolution :          1280 x 800
Profondeur de pixels :          Couleurs 32 bits (ARGB8888)
Miroir :          Activé
État du miroir :          Miroir matériel
Connecté :          Oui
Intégré :          Oui
Is that what you asked ? Do you need other data ?
Note that I have also strong distorison when running slides show with iphoto.
Thanks

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Regards
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Same happended to me, just call to support center and thay said there`s no such failure on their data base, and that i have to fix it my self, this folks only care about their wallets they don't care about customers.

Faint horizontal lines accross iMac lcd

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