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IMac :: Strange Black Lines On Screen?

See the pictures. They look almost like ink but no ink has been near the screen.Tried cleaning the screen but with no luck. It lies on top of any open window.

View 3 Replies (Posted: Apr 18, 2010)

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OS X :: Strange Black Lines Constantly On Screen?
recently i've been having problems on my mac as its begun to slow down drastically over the last few days and i've been seeing these strange outlines around some of my programs (see image).

Posted: Jun 15, 2010

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IMac Intel :: Noticed Strange Lines / Marks On Bottom Of Screen
I have a 20 in flat screen that is about 3 years old. The other day I noticed strange lines/marks on the bottom of the screen. On a light page the marks are blue and on a dark screen the marks are red. The marks remind me of smears, like if you go to the store and the register tape is running out and it puts those funky marks on your receipt. It gets worse when I scroll up like it is smearing on the page. I just hope this isn't going to be an expensive fix.

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Posted: Sep 4, 2009

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OS X :: Strange Black Box And Lines Around Windows And Dashboard?
As you can see from the video there is a strange black area surrounding my windows, but only when there are "active," not when I click on the desktop. The iTunes window is unaffected. Additionally the Quicksilver command interface and the Dashboard have a discoloration which is very annoying. Do you know what could be causing this? This behavior goes away when I restart my computer but eventually comes back. I have not been able to tie it to a specific app yet.

This is on a white macbook that I've had for almost two years, but this only about one month old. It didn't use to happen very often but nowadays it happens almost every day.


Posted: Mar 10, 2010

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IMac Intel :: Having Faint Black Lines At The Top Of The Screen
I have 2 faint black lines at the top of my screen that are "burned" into my screen from the safari address bar. I don't understand how a 2 month old iMac is already having screen problems. How can I fix this issue. I will not take the iMac in for repair because Ive read it doesnt help. I have been on the computer all day and the browser has set in that specific position since 6:00 a.m.

Mine are that color. Except they are the outline of the safari address bar.

Mac OS X (10.5.7)
3.06 GHz 1.0TB Serial ATA Drive 4GB 1066MHz DDR3 SDRAM - 2x2GB NVIDA GeForce GT

Posted: Aug 21, 2009

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IMac :: Display Got Black And White Lines / On Starting Screen Goes Blank
So for the first time in over a year since I purchased it, my iMac crashed twice.The first time was this morning, i went to do something and the screen went black, and my secondary display got black and white lines. I had to restart. And the boot screen with the apple logo hung around for a while.

Then, later on the screen went whacky after trying to wake it from sleep (not full sleep just display sleep) and had a bunch of moving lines and then I couldn't see anything. So luckily I got a picture. After restart, it seems fine.I'll call apple care in the morning, but thought i'd try my luck here.

Posted: Jul 22, 2008

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IMac Intel :: Constantly Freezing / Grey And Black Vertical Lines Took Over The Entire Screen?
I have been experiencing this problem for weeks now, the display will stop moving with the exception of me having the capability of moving the cursor, then it will show the color wheel to show that it's loading, then after a few minutes of that it will go back to just being frozen and I am forced to turn off the computer by holding the power button(no good). Also, a few minutes ago I was video chatting with a friend and spontaneously, grey and black vertical lines took over the entire screen and I was once again forced to hold the power button till the computer turns off(this was the first time anything like that has ever happened)

Mac OS X (10.6.4)

Posted: Sep 28, 2010

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OS X Leopard :: Lots Of Crashing - Freezing And Strange Lines On Screen?
I dutifully update the software when asked and suddenly I have all the following symptoms. A small line appears in some windows; it's multi-colored and about 3 pixels high. It goes away when I resize or play with the window. My computer crashes more often when being woken up from sleeping by pressing the mouse button; I will press my mouse to wake up the computer and it just shuts off. This has happened for the past year but happens much more frequently this week after the recent update. I took it in to the apple store months ago and they could not repeat it. It happened 3x today. A few programs have frozen / stopped responding, way too more frequently than normal.

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Posted: Mar 15, 2009

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MacBook Pro :: Strange Purple Lines In Pattern On Screen
i have had a Macbook Pro which I got in mid 2008 and it just yesterday began doing something strange. After working in Mac OS X for a while I saw that many of the white areas on my screen were filled with purple lines. Most of my pics in my background are outlined with varying colors and I cannot figure out what is going on.

I began to suspect the graphics chip at first, so to test this theory I plugged it into an external display and the problem did not exist there so I concluded that it was not due to the graphics chip. I have a friend who performed some tests and believes that it is a problem in the connection between the monitor and the graphics chip and that certain bits of data just aren't making it through. I thought that this was a feasible problem, but to get a second opinion I took it to the local apple store on my university campus and they looked at it and also concluded that it was not a graphics chip problem, but that I may have to replace the whole display assembly. This was fairly expensive and I cannot afford to do that since time got away from me and I forgot to purchase applecare. (How stupid of me. Aargh!) Anyway, so I was wondering what is believed by the macrumors community to be the best option. I discovered that this problem seemed to happen on a lot of this particular model of macbook pro and that apple offered to replace the graphics chip for free because of it, but since they do not think it is a graphics chip issue, it appears that I am stuck.

Posted: May 3, 2010

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Hardware :: Strange Screen Artifacts - Red Vertical Lines
I was using Audacity on my mac running 10.4.11, on some seriously large files (85MB mp3s were exported from these original wav files!), when during this these red vertical lines started popping up on my screen; mainly where a window had been moved. These lines haven't gone away and I'm not sure how to fix this problem. I'm stumped! Having repaired permissions and run the Disk Utility from the Install disk, I'm at a total loss. The intro/gray screen, apple logo doesn't have the red lines, but every other screen does.

Posted: Oct 25, 2008

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MacBook Pro :: Strange Purple And Luminous Green Lines On Screen
When I powered up my 3 months old macbook pro today,out of nowhere, screen started acting weird. There are purple and luminous green lines all over. Lines are shivering, hard to describe. I have seen this kind of stuff when my old desktop pc had some issues with the graphical card. I am not sure If it is the case right now.

macbook pro 13 inch 2010
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Posted: Aug 27, 2010

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IMac Intel :: Strange Lines Appearing On Display
From 2 weeks my iMac shows strange lines: It happens randomly and when these lines are in a window, they disappear just resizing it.

iMac 20" C2D
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Posted: Nov 27, 2009

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PowerPC :: IMac G5 Strange Vertical Lines Of Squares?
I have a problem with the display of an iMac G5 20". It shows up as vertical lines of small squares.

If I change screen resolution, the display will look ok for about half a second, and then it comes back again. Anyone had seen this before? (This is does not look like the usual problem with iMac and thin vertical lines.)

Posted: Nov 2, 2008

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MacBook Pro :: Its Screen Is White With Strange Black Marks
My 2008 MacBook Pro (17in) has just started up with a white screen and strange black marks - almost like ink spilled on white paper. I cannot get anything else.

Info:MacBookPro, iOS 5.1

Posted: Apr 8, 2012

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Intel Mac :: Old Has Black And White Lines On Screen?
I've had my iMac for over 2 years now. Last Thursday, I left it on for more than 3 hours and it started having black and white verticals lines appearing on the bottom and top part of my desktop and the cursor. Yesterday, when I checked it again, it was still there! What can I do to fix it, WITHOUT going to a Apple store?

iMac, iOS 3.0.1, URGENT!

Posted: Jun 12, 2012

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MacBook Pro :: Black Screen Or Multicolored Horizontal Lines All Over
A few days ago my Mac Book Pro screen freaked out. Specifically, it had multicolored horizontal lines all over, but underneath I could see a dark grey dialogue box telling my to restart the computer. Now, about two thirds of the time, when I try to start up the screen stays black and it does not make any startup noises but the power light comes on steady. One time this was accompanied by a beeping tone that beeped in sets of three. The other one third of the time it starts up fine. Once it shut itself down after the horizontal lines appeared again. Once it has frozen while on the screensaver and I had to manually shut it down. My computer is still under warrantee but I live over an hour and a half from the nearest apple store.

Mac Book Pro
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Posted: Sep 18, 2010

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MacBook Pro :: Two Thick Black Lines On Either Side Of Screen?
I have a macbook pro and two thick black lines came up on either side of the screen. My parents have a macbook and it happened to theirs too. Why did this happen and is there any way to get rid of it?

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Posted: Jan 4, 2011

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OS X :: Faint Black Lines On MBP Screen (pics Included)?
Sometimes my MBP gets these faint black lines that seem to start at the bottom on the screen and fade away as the near the top of the screen. I took a picture. Anyone know what causes these?

Posted: Mar 12, 2008

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MacBook Pro :: Red Vertical Lines For Black Screen?
My MacBookPro 15" 5.3 worked fine until today, All the blacks (rgb 0,0,0) on the screen become red stripes.

When I boot into Linux or Windows the same problem appears, so it's probably a hardware problem.

I have no expensive adaptor to connect to an external lcd screen, so I don't know yet if the problem is in the mac screen or in the cabling or somewhere else...

Here are 2 screenshots of black squares a drawed in Illustrator, one taken on the mac (cmd + shift + 3)

one taken with a camera (where you can see the red lines)

I want to avoid the MacStore as I want to avoid missing my laptop for a month...

Posted: Mar 13, 2010

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Intel Mac :: Vertical Black And White Lines On Screen
Simply using my Imac for watching tv on the web, Hulu, and left to help my wife get groceries in the house. My wife checked her email and closed Safari.

I came back in roughly 10 minutes from when she shut down Safari to see a black screen with white pinstriping, and the mac being totally unresponsive. Shut down and rebooted, sent off the report to Apple, and am now here with seemingly no problems. 

Needless to say, as a photographer this computer is just about as important as my camera. Should I be worried? discovered the thread to this issue, which appears to be quite extensive. 

iMac (24-inch Early 2008), Mac OS X (10.6.8)

Posted: Mar 5, 2012

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OS X Tiger :: Black Lines On My IMac G5?
I have a problem with my iMac G5 (PPC). There are black lines and dots around most things (see screenshot). I have restarted the computer and turned it off - unplugged it, etc, hoping it would do something but these lines appear over icons, the mouse cursor, the dock and some applications are impossible to use such as iWeb and iPhoto as the lines obstruct 90% of it. Other applications like iTunes and Safari are fine.

Has anyone had this problem? What can I do to resolve it?

Posted: Jul 23, 2009

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Power Mac G5 :: Screen Displays Black And White Lines With No Images?
I was updating my HP printer and hp had a firmware update that didn't work and just continued with no end. I had to force quit and restart. Now when I restart I get the apple on grey as though I have a bad antenna reception on a tv look, followed by blue screen with that same effect and eventually black sscreen with white static jumping lines in both directions.

Posted: Jul 12, 2009

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MacBook Pro :: Screen Consists Of Black And White Bars / Lines?
I got a brand new 15" i7 MacBook Pro today. Things were going fine until this evening, when I clicked on something (not sure what) and suddenly my screen went from normal to a series of black and white horizontal lines or bars, each about 1/2 inch thick. I could still see and move my cursor around, but couldn't see anything else. The computer responded to keyboard input and I was able to restart.

On restart the grey apple appeared along with the spinning wheel. Then the screen went blue, just like it always does before you get to the logon screen. But instead of the logon screen with space background, it went back to the black and white bars.I shut it down and restarted again, this time in Safe Mode, and am having no problems. (Other than being in Safe Mode, of course!)I also ran the hardware diagnostics and they're telling me the computer is fine.I'm back in Safe Mode to send this. Can anyone suggest anything else? I'm leaning towards thinking this is a software issue, that there's some preference file or something I need to delete, I just don't know where to begin.

MacBook Pro 15" i7
Mac OS X (10.6.3)

Posted: Jun 20, 2010

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Mac Pro :: Static Lines In Video Black On Computer Screen?
I have a new mac pro, 8 core, and when I fire up quicktime or FCP or DVD player, and watch a video, there are static style lines in the black sections. there are more when the video window is on the left side of the screen. When I move the video window over to thr right the lines get less and sometimes disappear. Thing is, I like and need to watch full screen on occasion.

Mac pro 8 core, purchased Oct. 2010
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Posted: Oct 19, 2010

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Software :: Macbook Pro Freezing And Displaying Black/gray Distorted Lines On Screen?
my macbook pro has been freezing and crashing lately. the screen ends up looking like this: [URL]

i have checked/repaired disk permissions.

not sure what could be causing this problem.

Posted: Oct 19, 2009

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MacBook Pro :: White Screen Flickering And Now Black Blurry Lines That Flicker - How To Fix Or Repair
I have a 17" mbp unibody (purchased around May 2009) and all of a sudden the screen just went white, started flickering on and off and made it very hard to work It also does it in Windows 7 (via bootcamp) and while starting up.

Here's a 3MB video of what I experienced:


Macbook Pro 17" unibody
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Posted: Jun 7, 2010

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OS X V10.5 Leopard :: IMac Screen Went Black - Starts Up With Black Display
I came back from work to wake up my iMac. It made the noise but the screen stayed black. I tried restarting by holding the power button- I can hear it start and the chime but still have a black screen. I tried resetting the pram, and unplugging the cord but I still get a black screen. I can hear the chime though; I'm not sure if that means anything. I just had the hard drive replaced in February so I hope it's not that. just wanted to clarify that when I restart, I get the chime but the screen stays black- I don't get to the grey screen. So I'm assuming right now that my display may be shot?

iMac (20-inch Mid 2007), Mac OS X (10.5.8)

Posted: May 24, 2012

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MacBook :: Got A Black Screen That Said "No Bootable Disk Found" Or Something Along Those Lines?
After I updated to 10.5.7 I experienced a few issues. First of all, after the initial update I restarted the computer than I got a black screen that said "No bootable disk found" or something along those lines, this was fixed after 4 restarts. Also after the update i experienced problems while trying to browse the internet. Some pages would load, but others, like google, and theMacrumors "forums" page, wouldn't load completely. I was just wondering if anyone else had experienced issues like this or anything similar.

Posted: May 12, 2009

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Mac Intel :: Imac Magenta Screen & Vertical Lines - Slow Resolution Screen
iMac 21.5, just 3 months old. running 10.6.3 we now see patchy magenta tinted screen and a low resolution version of the desktop. computer seems to function as normal, screenshots of course dont show the issue. screen seems to be 'half rez' vertically showing the 'scan lines' easily

Posted: Aug 26, 2010

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IMac :: 24" Screen Weird Hatched Lines On Screen?
First of all I'm new here so just wanted to say 'Hi', its been great to see all the discussions on these forums and they help a lot with buying tips and troubleshooting so thanks.

Problem #1 I purchased a refurb 24" 2.8GHz imac early May and have been using it since then and so far other than the "normal" gradient issue and a brownish tinge around the edges of the screen it has been good.

Lately I've been using Aperture a lot and first started to notice that in some pictures especially ones with quite a bit of highlights like clouds that there are small hatch like patches in all the pics. I know it isn't the pictures but the imac screen itself as you can see it on the desktop as well. It only seems to be centralized in the upper left hand section of the screen and they seem to be lite purple/blue in color. And like I said its only in patches in certain spots on the screen. Don't know if I'm being over anal about this or is this a problem?

Problem #2 I switched to a solid blue background to check the above problem and notice that there is screen burn in of the top and bottom header in the outline of my firefox window on the blue screen. Between switching windows often and applications very frequently and not leaving the computer at all... what the heck? Not normal for imac screens is it? Heat issue causing burn in? Hasn't been an issue with any other LCD I've ever used.

By the way the imac came in a new white box and was wrapped like new in perfect condition but I popped it open without ever starting it once to make a hard drive swap and the thing was definitely a bit dusty inside so in now way was it just used for a couple weeks before being given back to apple.

Posted: May 24, 2009

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Software :: PDF With Strange Marks And Lines In Preview
Something has changed with Preview on my system running Leopard. For some reason, most PDFs opened in Preview have strange lines in them. But if I open the PDFs with other apps like Adobe Reader, there are no lines. Anyone know what these are, why Preview is displaying them, and how to get rid of them?

Posted: Apr 24, 2009

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I have an iMac G5 (rev. B with ambient light sensor) which has suddenly started having a problem where the entire screen is covered with pink artifacts. The iMac had been left on overnight and when waking up in the morning I found the screen looking like this and now it continues to stay like this no matter what I do. I have attached a screenshot and was wondering if anyone might have a clue what has caused this to happen

Posted: May 11, 2009

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Mac Pro :: Strange Dots And Lines Directly Under My Cursor?
I have booted my Mac Pro up this morning to find there are tiny black lines and dots underneath the cursor arrow.

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Mac Pro (Early2008) 8 core 2.8ghz
Mac OS X (10.6.4)

Posted: Oct 30, 2010

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I went away for the holidays, and when I got back I booted up my 2006 iMac. Today for the first time, there are strange lines appearing behind iTunes whenever it is open but not the active window. I tried quitting and restarting iTunes, but the lines come back. I wish I could upload a screen shot of what this looks like on my desktop, it's very weird. It does not happen behind any other program window. Only iTunes. The lines appear as if they are extensions of the iTunes window formatting, in line with the side bars, etc.

iMac OS X (10.6.5),
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Mac OS X (10.5.2)
iPhone, iPod, etc

Posted: Feb 3, 2011

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I've had my 27" iMac since march this year, yesterday I noticed that there is a strange yellow/brown blotchy patch in the top right hand corner, it is not on the front of the glass (it cant be wiped off) its on the INSIDE! I tried to take some pic's but my camera is useless and it looked like it was picking up a lot of light interference from the display itself. Anyway I have done some reading into this and a common thing that came up was smoke, well I don't smoke so it's not that. I don't have Apple Care but its still under the first year of warranty, and I don't have the balls to take the glass off and clean it. And is it covered under the first year of warranty.

Imac 27"
Mac OS X (10.6.5)

Posted: Jan 30, 2011

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i have an intel based 17" White imac.

it has over the weeks had and increasing number of vertical white lines appearing on the screen.

does any one have any idea of what is causing the problem, and the solution?

Posted: Jan 6, 2011

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MacBookPro, 1.83 GHz, 1GB SDDRAM
Mac OS X (10.4.5)
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Posted: Jun 4, 2009

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wondering if anyone has come across this problem?

I had been away all weekend, no-one and nothing home, imac turned off. turned it on and after about 1hour of it being on, a very strange blur appeared on the screen, centre top third.

At first i thought someone (though who, i would not guess) put their grubby mitts on the screen and i hadnt notice, so i cleaned the screen with the apple cloth and a damp soft cloth. Nothing happened.

It almost looked like a case of screen burn - a big bright spot on the screen when viewed from the side.

I restarted the imac - no change.

restarted again - no change.

walked away for about 5 minutes and the blur had shrunken to nothing!!

Could this be some sort of damp spot or temperature difference causing it, because i had it turned off all weekend?

iBook G4, Intel iMac
Mac OS X (10.5.7)

Posted: May 24, 2009

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my iMac is just over 4 months old and I have 2 horizontal lines going across the screen. They're barely visible atm unless i go into expose when i can see them clearly.

iMac, Macbook, Mac Mini, eMac, iMac G3.
Mac OS X (10.5.7)

Posted: Jul 22, 2009

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I have a 3.5 year old 17" Imac. About a month ago a pink vertical line appeared on the screen. Today its been joined by a blue one and a yellow one. I don't have applecare and I'm out of warranty.

Posted: Nov 26, 2010

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