IMac :: 24" Black Screen Flicker - Is It Lcd Fault
Jul 29, 2010
Recently i've started to experience my iMac screen flickering for approx 2 seconds, and then turning back on. I was wandering if this was a common problem with this model of iMac (purchased mid-09, 2.66ghz 4gb ram model). I had read of such a problem with the new 27", and in some cases even with the 21.5".
I have only recently begun to use the iMac for relatively graphically-intense tasks, and was wandering if perhaps it could be a dying graphics card (or perhaps it was always faulty, but the lack of intensity of any programs run never pulled it up originally?), or if maybe it was an issue with the LCD?
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Oct 31, 2008
So I got a new Late 08 MBP 2.8 earlier this week. Everything has been great except that occasionally (once or twice an hour) my laptop screen will go black for about 200-300ms and then come back. Often only the top 1/2 or top 3/4 of the screen will go black. I was worried it was the LCD, but today I switched over to the 9600gt for the first time and the problem seems to have gone away. I generally code all day and havent been doing anything intense when the flickers happen, the CPU/GPU temps are also low.
I have an external monitor hooked up. Ive only noticed the problem when the external monitor was hooked up but then again 90% of the time I use the computer it has the external plugged in.
Also does anyone know if the 9400m's 256mb of memory is shared with the main RAM, ie if I am running on the 9400 do I only have access to about 3.74 gigs of ram?
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Jun 23, 2010
I have a MacBook Pro with the 9600gt in it. Since updating to 10.6.4 this morning 2 times while playing java games i've had the bottom half of my screen go black and most of the top half flicker. I've had to hold in the power button and reset both times. The second time I closed the screen and reopened it, the screen was black but no mouse and nothing moved.
Any advice? Would this be something to do with my graphics card or possibly some error in 10.6.4?Edit:: This is software related to 10.6.4 update and only happens when I open up a java game in a browser.
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Jul 27, 2009
i bought a used 24" aluminum imac (2008 model) that was about 6 months old, but recently the screen has began to flicker...usually from a half to a full second every few hours or so. it sometimes will flicker if the mac is nudged on either side, but this doesnt always happen, even when i TRY to initiate it. its not really major, but im just worried that the whole display will crap out soon. ive found threads about screen flickering with macbooks and led displays, but nothing for imacs yet. im not sure if this matters, but the person i bought it from opened it up and replaced the hard drive. another contributing factor may be that i constantly run torrents and my mac sometimes stays on for days at a time. it doesnt seem to overheat and ive never had this problem with my other imac (2007 17" white). when im not using it, i keep the disks active, but put the monitor to sleep to prevent burn in. im assuming that since this guy replaced the HD, this would void any warranty, so i think im pretty screwed as far as thats concerned unless i pay out of my own pocket.
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May 24, 2012
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?
Info:
iMac (20-inch Mid 2007), Mac OS X (10.5.8)
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Apr 14, 2009
This is something I've been wondering for a long time. I seem to have a lot of screen-related issues with the Pros that I sit in front of in the main. Brightness controls going haywire displays not turning on, etc. There is also the odd attached USB device lockup, but I'd been putting this down to the devices themselves and the occasional, app-level instability of Leopard. More recently though, I've been seeing a pattern that's leading me to suspect the Pro's more than the peripherals. Is there a documented case of possible USB hub connection issues in (fully patched) 2008 Pros? The most frequent issue is monitors not behaving as expected when the system is booted until the monitors themselves are unplugged from power. There are also less frequent but present problems where iPods lock up, keyboards stop working, etc. I can't really abstract the problem down to an OS issue or a hardware issue, but the need for me to unplug the monitors seems to indicate that there is some sort of USB initialisation issue - as with the other minor problems I experience with other monitor-connected USB peripherals. Since I only use multimonitor environments as far as my Pros are concerned, all USB connections are usually made from the backs of the screens. So the big question is is this a screen USB hub fault, or a main-unit intermittent fault? All of the monitors I'm using have been to Applecare for one reason or another, although I'm not sure if they check everything in these repairs.
Can anyone else shed more light on this issue? It's pretty hard to replicate reliably and it's not been something I can go to Apple with any degree of certainty, yet the little minihoops I have with this problem (and oh so many other Apple issues, but that's by the by) irritate me immensely in comparison to my rock-solid, near-zero-such-issue, non-Apple environments which I also use daily.
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Jan 2, 2011
I recently upgraded to a Macbook Pro 15" with a mini displayport, and I decided I would share my LCD monitor with my windows box. The desktop box is connected with DVI and I have connected my Macbook through an HDMI adaptor from Moshi. Everything works very well, and I'm pleased with the quality of the output, but I'm having trouble with a screen flicker in full screen games.
When I select full 1080p (1900x1080) in any full screen game, the screen "shudders." It does not occur on the OS X desktop, and I can only explain it as a shudder. Lines and text shift perceptively left and right, and the game is unplayable. I have experienced this problem in Starcraft 2, World of Warcraft, and Half Life: Episode 2 so far.
Could the problem be with my monitor and the way it handles an HDMI signal? The Macbook is flawless otherwise, with no other issues of any kind. The "shudder" only occurs during full screen games set to 1900x1080. Lower resolutions are not effected and work fine...
I'm stumped.
Edit: I should add that I have no other 1080p capable devices to test the output with.
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Oct 14, 2009
I am using the pair with an early 2008 Mac Pro octo 2.8. Previous card was a 8800 GT, and previous monitor was a dell 2405WFP. No issue there (other than the 8800's fan noise).With the new setup, I occasionally get a whole screen flicker for a split second, and just now when I woke the display from sleep I got multicolored snow covering the entire screen, like this:
http://picasaweb.google.com/lh/photo...eat=directlink
(iphone photo, all I had handy)
Has anyone seen this with either the EVGA card pushing some other dual-link 30" display, or the 3007wfp-hc driven by some other card? I don't really have an easy way to test this myself, as it is pretty intermittent the two arrived around the same time, so I'm not sure which is the cause, but I haven't seen any problems like that in XP so I'm leaning towards the card (drivers, perhaps). I don't spend much time in XP, though, so I'm still not sure.
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Feb 25, 2008
In the last 5 days I've started noticing a strange flickering with images loading in Safari both static and in-line video e.g. cnn.com. A few days ago at lunch while home I opened both Safari and Firefox, opened cnn.com and then clicked on a video. With both videos playing at the same time it looked fine in Firefox but flickered in Safari. I've noticed the same issue with static image loads too. In FF the image loads no problem, in Safari it flickers. I don't think this is related to the video card (8800GT) but sounds like a software issue to me.
Anyone else having a similar problem? BTW, I'm running 10.5.2 with all the latest updates. I've subsequently noticed that turning the machine off and on again relieves the problem?
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May 7, 2012
My imac screen has just started flickering. I have researched it and it already a problem with other mac's.
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Jan 2, 2011
Got me a Second Hand iMac g5 with OSX 10.6 on Screen is black. I changed Power Cable = no Result seen i opened and a thinny Cable from hard drive were not connected. I had to remove the Ram to do that,but no Result i opened again and found another thinny Cable from Broadband Socked comming out. I connected it but nothing happening i opened again with all Leads removed. I removed the Battery inside,pushed after 2 Hour such small Button inside,put Battery in Place,switched on and nothing happened. i pressed the power-Button twice,and on second Time the Screen went White and Fan blow as Hell,but stuck on that. I switched off and on and it was Black again. I disconnected the Lead and switched on after 5 Hour and nothing happens I removed Battery again,pushed after 2 Hour thinny black button inside and nothing when started With nothing happened i always mean "The screen is black",but the Start sound is and i hear a little Fan,and Keyboard reactes with Light on keyboard and with Ping on Computer if i push some Buttons.Mouse has light on Well. seems Screen works. I did not get the Software. It is Snow leopard on but i don't know if re-installing would help or if i need the Pack for 3150.- or what it cost. I also don't know if not Video-Card or logic board fails
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Oct 1, 2009
My monitor has been flickering in all my graphic programs. I'm thinking this has something to do with OSX 10.5.8 and the ATI Radeon 9000 card in my G4 MDD. I've swapped out the ATI card for another of the same quality to see if I get the same problem. The flickering came back. I am now trying out a generic lcd (cornea) to see if the problem occurs.
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Apr 27, 2012
I have had my imac 21 for about 5 years Model identifier say 7.1. running OS 10.6.8 Has been going well apart from a new hard drive. Suddnely tonight the screen flickers when you first turn it on for a few minutes and then settles down but dims down where whites become a light grey. Tried turning off the monitor screen power off and power saver.
Info:iMac, Mac OS X (10.6.8), ilife 11
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May 25, 2012
I bought a new HDMI adaptor for my 17" Macbook Pro. I'm plugging into a full HD compatible TV, into an HDMI port.The result is a consistant switch between the actual correct display, and colored static. The rate of the switch is dependent on the frequency of the refresh rate, but there's no way to get it anywhere near comfortable to use. I have tried changing resolutions on both sides to no avail. Here is a video of the screen periodically flickering between display and static url...Also have tried other HDMI ports and cables, all of which are known to be in working condition. Tried restarting the tv and computer. Running out of ideas and hair.Troubled Mac User
Info:
MacBook Pro, Mac OS X (10.7.3)
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Aug 4, 2009
Let me start by saying I have swapped the ram in the computer and the problem persists. I've also tried resetting the PRAM. I have unplugged all devices except the keyboard and mouse. I have reformatted and installed OS X Leopard, Tiger and Snow Leopard. I have even encountered this issue while the computer was running from the install disk. I'm pretty sure software, ram and third party devices can be eliminated from the possible causes. The computer continues to run after the screen goes black. I am connected to it right now using screen sharing, so I know the computer is still working. Putting the computer to sleep and then waking it up temporarily brings the screen back until its next random blackout. I have opened the computer to replace a dead HD, so I suppose it is possible that I knocked something in the process, but I did that back in December and the problem is a relatively recent development. I would really prefer to fix this myself, if I could only figure out what the problem is.
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Mar 31, 2010
I have been experiencing some unusual problems with my imac. While on the internet today my computer crashed on me twice, the first time the screen just showed a bunch of vertical lines, the second it flashed some random colors then went black. After the screen change the computer was unresponsive. I have a bad feeling, is it due to overheating, a bad logic board or something else. This is the first time I have ever experienced this on a mac. Has anyone had any simiar issues? Or am I up **** creek? I can't really afford a new computer seeing that I just bought an iPad (it comes Saturday). I am not sure if my computer is still under apple care and even if it was I won't get it back by the time I have to go back to college. I attached a screen shot of my computer temps.
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Apr 26, 2010
When I turn my Imac, it goes from the white screen to a black screen, then blue and then desktop. The whole process is fast, but is not normal. (at least is not like my previous MBP or the videos that I have seen on youtube) At the black screen stage, I can see some boot up information, etc, It is fast so I am not able to read it all. It looks like when booting an old windows or dos machine How can I change this? Is this normal? It also shows the screen when I shut down.
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Mar 14, 2012
When I try to type an uppercase letter using the left hand shift key, the screen background turns black and no letter appears.
Info:
iMac, Mac OS X (10.5.8), power pc
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Mar 19, 2012
I have been limping along for quite some time with a recurring problem with my PPC Flat Panel iMac G4.Sometimes when starting up I would get a black screen. The unit chimes at startup but the screen would stay black.I found that I was able to fix (temporary) the problem by removing the bottom plate and pushing the reset button under the base.(After shutting down and unplugging the unit.) after the startup chime, the screen turned gray with a folder icon in the center with a blinking question mark.After shutting down and restarting, this happened again 3 times.On the 4th shutdown/startup it went back to the black screen.Repeated shutdown/restarts have no effect.Shutting down, unplugging the unit and pushing the reset button is also having no effect.I hear the startup chime every time. Black screen every time as well now.Â
Info:
iMac, Mac OS X (10.4.11)
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May 1, 2012
my iMac(mid-2010) screen goes black soon after startup.i did notice some flickering about a week ago.i tried shutting it down,removing the power cord and all peripherals but it didn't help.i had done a software update a few days before the flickering started.
Info:
iMac (21.5-inch Mid 2010), Mac OS X (10.7.3)
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Oct 28, 2010
My screen just started to occasionally have a flicker of a white line show up...
It doesn't happen that often, should i worry? Is it worth taking it into apple? (Under warranty still) Since its not consistent i wont necessarily be able to show them what its doing..
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Aug 24, 2008
Handbreaked some stuff to be played with my appleTV. The files are 600mb-1Gb files (720x480?) with one pass deinterlace. The problem is that when I am playing them with my macpro, I get a white flicker when trying to play them full screen. Like a white strobo. When resizing the window smaller, they develope a black flicker. Only when doing playback in a smaller window (1/4 of the screensize) they play back normally. Display is a 30",so is my 7300Gs such a useless p.o.s or what is going on?
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Jul 3, 2009
I have a 13" MBP 2.53GHz, and I absolutely love it. However, I have one issue. I am using an Apple display port to DVI adapter to run the MBP in clamshell mode with my Samsung 221BW monitor. On websites or programs with a dark grey background, the screen flickers. The resolution is set to 1680x1050 (native) and 60Hz.
Does anybody else have this problem? Any ideas as to fixing it?
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Feb 3, 2010
I don't know if it depends by a latest update I did to Itunes but after an uncertain amount of time my MacBook Pro 2.2Ghz Santa Rosa start to flicker. I have posted a video in youtube [URL] so you can see what happend. For a small amount of time while flickering is started the mouse can move around then it stuck and lock me out of the system. I have to reset many time PVRAM and SMC then it will restart until it lock it down again. It worked flawlessly until yesterday after if I don't remember wrong one or more software update. I use Snow Leopard (official licence). I downloaded the Combo Update for Snow Leopard and ran it. I still have to test it again. Since I need to do some work in the next 48 hours I can't full test it. After the hard reset an image pop out and It won't let me start up the system again ever if I reset many times PVRAM and SMC Then I use bootcamp to "unlock" the MBP. I do run windows under BootCamp. It will run but I can't see anything since the video remain black (I hear the HDD until stop working) Then I push the power down button and I turn off the windows Then after a long time it will log into Snow Leopard! I'm getting crazy the last two days
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Mar 12, 2010
I've noticed recently that occasionally my screen will intermittently flicker.
It doesn't seem to be tied to anything specific. Just a random black screen flash.
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Jul 5, 2010
Every time I moved my MacBook Lid my screen turns off and starts to flicker? Is there anyway you think i will get covered I haven't got any warranty left in it either.
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Apr 3, 2012
My over 3 year old MacBook Pro Unibody (Late 2008) have a giant problem. The 9600m GT GPU is not working anymore, when booting up with that card the screen flickers and the OS crashes. I have been apple to boot it up with the 9400m GPU, where it works somewhat, no screenflicker, but it does crash alarmingly much as well as giving me a lot of kernel panics. (sometimes it can't boot the OS before freezing, and other times it crash while trying to shutdown the OS).Â
Since it is over 3 years old, there is no more gaurentee, so my question is:Â
Info:
MacBook Pro, Mac OS X (10.7.3), MacBook Pro (Late 2008)
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Sep 24, 2010
The screen randomly turns black without any major reasons. It doesn't seem to be a sleep mode/screen saver thing as the music continues to play on. I can adjust the volume or pause the music with the keyboard but the screen just won't turn back on. I have to shut it down using the power button and it happened several time the last couple days. Anyone else experience the same thing and got a solution?
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Dec 1, 2009
I decided I was going to install XP on a bootcamp partition tonight and everything went fine until I installed the Bootcamp 3 software. After installing the Bootcamp drivers the machine rebooted and I ended up with a black screen in Windows. I did hear the XP welcome music so I figured it was a display driver issue. I rebooted into safe mode and deleted the ATI 4850 driver and restarted. After removing the bootcamp driver everything was normal again other than the fact that I only had the default Windows drivers running.
What am I doing wrong? I installed XP off of an XP disc with SP2 already on it and ran the Bootcamp install off the Snow Leopard disc. Finally, not sure if this matters, I am running one of the new i7 iMacs.
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Apr 18, 2010
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.
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