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

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Try the standard fixes to rule out a software problem:
- 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 still problem that indicates a hardware problem and an appointment at the genius Bar of an Apple store is in order.

What can I do about the vertical lines on my iMac screen?

For the past few days there have been 2 lines, one a solid, definite white, the other faded toward the bottom. It's been almost 5 years since I bouight it, so out of warantee, but isn't there some solution, other than (ouch) buying a new one?

Had the same problem but with red vertical line to right of screen. Called support and was told this was either a problem with screen itself or video that is displaying lines on screen. Support was very patient and talked me through shutting down mac then holding down certain keys ( I forgot which ones) as I turn the power back on. Try calling support. Hope this helps.

Anyone know what causes thin vertical lines on my iMac screen?

Anyone know what causes thin vertical lines to appear on my iMac screen?

Hello,
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
Take a screen shot & view that in Preview, move the Preview window around, if you see double lines it's a Video card/VRAM problem, if the lines do not move moving the pic around then it's the LCD or cable.

Brand new ipod has vertical lines on the home screen

I just got a brand new ipod when I turned it on there are 4 vertical lines and 1 double horiziontal line on the screen

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Thanks for the question. Let's try resetting your iPod:
How to reset iPod
http://support.apple.com/kb/HT1320
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Take it to an Apple Store or other service provider for testing.

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is there an extended warranty involving vertical lines on my iMac?

Hello Royce, when did you buy it? Did ypu purchase extended AppleCare for it?
So we know more about it...
At the Apple Icon at top left>About this Mac, then click on More Info, then click on Hardware> and report this upto but not including the Serial#...
Hardware Overview:
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 6 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version (system): 1.21f4
At the Apple Icon at top left>About this Mac.
Then click on More Info>Hardware>Graphics/Displays and report like this...
NVIDIA GeForce 7800GT:
Chipset Model:    GeForce 7800GT
Type:    Display
Bus:    PCI
Slot:    SLOT-1
VRAM (Total):    256 MB
Vendor:    nVIDIA (0x10de)
Device ID:    0x0092
Revision ID:    0x00a1
ROM Revision:    2152.2
Displays:
VGA Display:
Resolution:    1920 x 1080 @ 60 Hz
Depth:    32-bit Color
Core Image:    Supported
Main Display:    Yes
Mirror:    Off
Online:    Yes
Quartz Extreme:    Supported
Display:
Status:    No display connected

My iMac has coloured vertically lines on starting up after a short while goes to blank screen

My IMac has coloured vertical lines on startup eventually changing to a blank screen

i have similar problem with macbook pro. https://discussions.apple.com/thread/4530266
but after resetting NVRAM (I followed the instructions from here http://support.apple.com/kb/HT1379) it runs normally, and appear from time to time now.
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HP iq772.uk multi coloured vertical lines on boot

Hi guys,
I've got a iq772.uk all in one shaped brick at the moment. All it does on start up is show me some random bunch of different coloured vertical lines. The hard drive and fan are buzzing away, so I just think this is a graphics card issue.
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Nicola

Keywords: IQ770 IQ772 graphics problem fix disassembly
I experienced similar problems. From digging around on the web, I found that HP Quinn Outsmarts suffer from a few different video issues. A really excellent website is www.touchsmartdevzone.com (look at the vertical lines screen problem thread).
Mine had a failed video graphics card. Here's what I did to resolve the situation:
Objective: Remove fried EXTERNAL graphics card and swap to the ONBOARD card (you won't be able to play graphically demanding games, but in all other situations there will be no difference), which is a Gofer 6610 with IAMB RAM.
Remember: Switch the power OFF, but leave the plug in. Earth yourself first by touching the chassis AND remember these instructions aren't aimed at technically incompetent people who are likely to hurt themselves, hurt others or break things along the way
Method:
Uncover the back part of base section. This is quite easy, as all you need to do is unscrew the two screws on the back of the base (one just above the power socket and the other on the opposite site, just by the Ir Out). The plastic cover slides backwards with a bit of a pull. This reveals around 75% of the motherboard.
Remove the DVD player. This, too, is quite easy. Looking from the back of the unit, the DVD is to the top right. Remove the cable connector on the end of the DVD. A bit fiddly and you may have to pull the cable for the mini VGA out to make some space. Lift the black plastic tab near the corner of the DVD and slide the DVD back and out.
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Remove the graphics card. N.B. You will break some clips doing this, so be sure you want to go ahead. The graphics card sits under a heat sink at the very front of the base unit, right in the middle. You should be able to follow a strip of copper (CM wide) from its top to the cooling fan at the back of the base section. A second copper strip runs to the CPU. The heat sink is held down by four plastic clips/springs. You need to break these to remove them. A small pair of pliers will do the job. Now remove the two small screws holding the card in place and then remove the card from its slot.
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You can buy replacement graphics cards, but they're not cheap (serial number is on the back of the cards). The card is an INVALID unit (could be 5188-7147 MGM GRAPHICNESS GM-MM CROSSFIRE). In theory, you could replace it yourself, but it will fry if you don't buy new spring clips, clean off the old CPU paste and apply new paste.
As I said in the Method, the first ten times I swapped the lead over, it simply didn't work and I was convinced the PC was for the bin. I reinstalled the old card and got it working for again for about five minutes, before it died with a bad burning smell. I reverted to the onboard slot one last time and found that it worked.
GOOD LUCK
Arnie

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Hi,
I know there have been many issues with the iMac screens, actually I hold my purchase for months back in 2010 because of the first issues found on the 27" monitors. I bought mine that year with a 3 year Apple Care protection plan, which expired about 6 months ago(summer 2013). After that I started to notice some thin(1pixel) vertical lines but they weren't visible most of the time, until recently that they became very obvious and present all the time(see attachment). They can be easily seen on a dark grey background, which is very annoying when you do graphic/web design.
I contacted Apple Care and they say I should bring the iMac to a near Apple Store and they will tell me how much I will have to pay to get it fixed.
I just wanted to know if there is anyone out there with the same issue that had to pay to get it fixed, just to know more or less how much can that cost. I don't live close to an Apple Store and I don't have a car, which makes it hard for me to carry such a big box and If fixing this issue is too expensive(> 500 euros), I will not repair it and live with a crappy screen.
It's an iMac 27"(late 2009), 2.8GHz Intel Core i7. With ATI Radeon HD 4850 512MB.
Thanks!

Hi,
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Why when I want to take photo , the camera will appear such pink colour vertical line and become black and the video just can record 1 min only ?

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hold home and lock button pressed until your iphone restarts.
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my imac27" freeze showing some pink lines and after this some dots...help!!!!
Early 2009 24" iMac - Startup Problem
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What program are you using for this editing?
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Satellite M60 BK300E. For full specification refer to http://www.toshiba.ca/web/product.grp?lg=en&section=1&group=223&product=4670 &part=3411#spectop
It's comparatively old model, about 3.5-4 years.
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Other way if the picture is normal it must be defective LCD panel on the laptop.

There are coloured vertical lines on my iMac screen?

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