Horizontal lines on my iMac screen

My iMac screen has developed multicoloured horizontal lines in random spots across the screen
Is there a fix for this?

How do I run in extended mode?
Model Name:          iMac
Model Identifier:          iMac5,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          2.16 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache (per processor):          4 MB
Memory:          2.5 GB
Bus Speed:          667 MHz

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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.
If the line is only seen on the Display and not in a screen shot, then it would most likely indicate a Display problem.
If the line shows up in a screen shot, then it would most likely indicate a Graphic's Ciip problem.

Thin black horizontal lines on 24" iMac screen/transparent dock icons

I have a 24" 3.06 GHz iMac (purchased in August 2008) and noticed after about a half hour of running basic programs (Mail, iTunes, Firefox) I start to get horizontal lines near the top and bottom of my screen. Then if I watch a full screen video I can see my dock icons look almost transparent through the video. I took my iMac into the Apple store last month and told them about it and they kept it for 3 days and ran their "tests" and stressed the computer out to get it to do it for them but they couldn't replicate the problem. They suggested that it might be my cordless phone is too close to the screen and the frequency of the cordless phone could be causing the problem but I tried moving the phone and it still does it. When the display is off for hours and I turn it back on the lines are not there, but once I have it on for a half hour they come back and don't go away until I power off or sleep the display. I've attached a few pics of what I'm experiencing. Thank you very much.
http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0091.jpg
http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0092.jpg
http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0090.jpg

Since the Apple Store folks could not replicate the problem, you may want to consider a cause that is part of your particular environment.
For example, if you use a power strip (surge suppressor), what else is connected to the same power strip? Is it possible that you may have too many power-hungry devices connected to the same single wall outlet, and the iMac is not getting sufficient power? Or maybe it's some electrical interference with another device on the same circuit? As a test, try disconnecting everything else, and see if the problem recurs, or connect the iMac directly to a wall outlet by itself to see if the problem recurs.
Try moving the iMac to a different location in your home and running it to see if the problem recurs.

Laptop suddenly had horizontal lines running across the screen

Suddeenly horizontal lines appreared across the screen .
I have shut down and started up the computer numerous times and it does not go away .
It also affects the graphics and text on the screen .
If I cannot fix should I have the computer cleaned and set back to factory standard and how do i do that /
Thanks

2 possibilities:
1. The video chip (motherboard) has gone bad; or,
2. Just the screen has gone bad.
Connect the computer to an external monitor and see if the lines appear on it. If so, it is #1.
It is doubtful that restoring the laptop to factory specs will have any effect on the isue either way but if you want to do that you can tap F11 as you power up to enter factory reset.

40 inch Samsung LCD White Horizontal lines running up the screen constantly

My brand new Samsung 40 inch tv (purchased in mid-December) has white horizontal lines running up the screen constantly. From what I heard, the electricity in my house my not be grounded, but no other tv in my house does this, so I doubt this is the case. Has anybody else had this issue and is it too late to return the tv? Thanks.

Does it do it on other sources like a DVD? If so you may have a TV problem. Have you tried to do a factory reset or restore? Have you tried plugging it into an outlet in a different part of the house? As a last resort have you tried taking it back to the store and see if it works there? Also have you tried a filter on the AC plud in? Just some suggestions to try and help you out.
Bob

Ipod first gen. has horizontal lines going across the screen. What should i do?

My iPod first generation has horizontal lines going accross the screen and sometimes the screen goes completely white. How do I fix that?

Try the following:
- A reset. Nothing is lost
Reset iPod touch: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Restore from backup
- Restore to factory settings/new iPod.
If you still have the problem that indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order

Horizontal Lines on my laptop screen

My laptop screen was damaged due to accident and I changed my laptop screen under warranty but now after one year of changing there is Horizontal lines coming on my screen and it is increasing.Due to horizontal lines my display is moving up and down therefore I can not see my display perfectly.I think they replaced affected laptop screen.
Is there any solution to fix it or change my laptop screen free of cost because its HP service fault.

Hi @navdeep195 ,
I have sent you a private message. If you are not sure how to check your private messages then this post has instructions that will guide you through the process.
Regards,
George
I work for HP

Problems with horizontal lines on the iMac. Someone knows the solution?

For several months my Imac has horizontal lines have been growing. Problems with horizontal lines on the iMac. Someone knows the solution?

You have 14 days to return the computer w/no questions asked. Plus you have 90 days of FREE phone tech support on top of your standard 1 year warranty unless you also purchased AppleCare which gives you an additional 2 years of coverage plus FREE phone support.
Strongly suggest that you take FULL advantage of the above before it runs out. Let Apple deal w/the problems.
That being said, no new Mac comes w/Snow Leopard which your profile confirms you have.
Mac OS X (10.6.8)

There are coloured vertical lines on my iMac screen?

So, I was browsing Safari using my iMac the other day (as I always do), when my computer froze and I had to force shut down. Upon starting back up, I noticed that 1. there were coloured diagonal lines on my iMac screen, and 2. that my mac would not boot up unless I booted it using safe mode. I haven't had an issue with this iMac until now, so I am kind of concerned...
I know that this is not an issue with damage to the iMac screen because, well, when I took a screenshot using shift + command + 4, the coloured lines were still there!
So, I'm just wondering if anyone knows what the cause of this issue could be? I'm wondering if it is linked to Safari (because when I open a new tab, Safari slows down massively and my top sites selection keeps appearing and disappearing rapidly. Does anyone know what is causing this issue and how I could solve it. I hope its nothign expensive like replacing the motherboard...

Yes, it does require some disassembly. Namely, removing the glass, screen and the GPU component. Total war could probably develop temperatures too high.
I don't know how familiar you are with reflowing. This is only a crash introduction, to get an idea what reflowing might include (i.e. not a detailed procedure)...
Reflowing theory to give you some background. Here and here in more detail.
To get familiar with iMac (only steps 1 through 9 apply). After that, GPU component can be taken out, and from that point on, the work is done on the GPU component.
GPU component is then disassembled in 3 key parts. The heatsink, the reinforcement, and the video card itself.
The video card and the heat sink are then cleaned carefully using alcohol from any residue of thermal compound. Any paper stickers must be peeled off, too.
Reflowing. Videos to get an idea how it is done. Here and here.
New thermal compound is applied.
Assembly.
It is a risky approach, especially if you are not comfortable with disassembling your iMac. In that case I would suggest you do not do that at all. Still, even then, I hoped it could give some clue to the issue and you might get someone to do it for you.
Cheers

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.

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.

Faded horizontal lines on 24inch imac

I have a 2.8GHZ imac 24 inch ser num W87351DPZCV from Late 2007 Just recently I have noticed some light brown faded shadowy horizontal lines on the display. It is not very noticeable unless you have a nice white background (like the new snow leopard screen).
I have checked the inside of the glass panel and cleaned it as well as the LCD screen its self.
This is a smoke free home.
There are 7 dull lines total. They are darkest at the edges and lightest in the center of the screen.
Does anyone have any idea what this is or how to fix it?
THANKS
Steve

Hi Steve
It sounds like your front glass panel which is held on by magnets needs to be removed and cleaning. Many folks have complained about both condensation and a film collecting on the inside of the glass panel because it is not sealed. If your iMac is covered by Apple Care make an appointment with your local Apple Service Provider or Apple Store and have it cleaned, if not see the many (some good and some bad) DIY video's in the YouTube link below and do it yourself.
http://www.youtube.com/watch?v=frfzESC-ahM
Dennis

Lines on my imac screen

About 3 months ago some horizontal lines started to appear in the screen of my imac, it does not have garantee anymore, and everyday it gets worst. Is there any thing I can do, or just spend the $$ on a new screen

A new display will run about $600 USD. At least that's what AppleCare picked up when they replaced the one on my 27" iMac.

I have a thin horizontal line running across my screen about 1/4 of the way from the bottom of the monitor. Why is it there and how do I get rid of it?

There is a thin horizontal line running across the width of my screen about 1/4 of the way from the bottom. This line, along with an occasional vertical line about a 1/3 of the way from the right side of my monitor, started appearing about 7 days ago. Usually the line would disappear after a restart but now it seems intent on staying. Does anyone know what is going on and how can I resolve this?

Contact Apple's Support, formerly Apple Express Lane.

A small horizontal line on my G510 screen

I've using my lenovo laptop for almost a year but lately i've noticed a small line on my screen , I connected it with my tv via HDMI and the line wasn't there , I did a printscreen and the wasn't there.
I tried to upload my graphic cards and nothing has changed .
Here is the problem :

Hi Sofiane,
Welcome to the Forums
As per the query we understood that you are facing issue with horizontal line on the screen in your Lenovo G510 laptop.
Boot the system into BIOS and check for the issue, also check in different applications. You can also boot the system into safe mode and check for the issue.
Hope this helps. Do post back if the issue persists.
Best regards,
Ashwin. S

Vertical black line running down imac screen

This morning i noticed for the first time (wasn't there yesterday) a thin black vertical line running down my 21' imac screen.
Any suggestions?

Take a screen shot & view that in Preview, move the Preview window around, if you see 2 black lines it a Video card/VRAM problem, if the line does not move moving the pic around then it's the LCD or cable.

Horizontal lines on my iMac screen

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