Flickering 24" iMac

I have a 2008 24" iMac (model 8,1) I bought it new in 2010 from MacConnection. This machine has been wonderful, however in the last week or so the screen seems to "flicker" upon waking from sleep (I rarely shut the iMac down.) The flickering lasts for a minute or two and is sometimes worse than others. Occassinaly the screen will distort and go black for a second or two, other times it just seems to flash. As I have said this only lasts for a minute or so upon waking the iMac. I can work all day without a repeat.
Has anyone else experienced this? Does it sound like a hardware problem, perhaps the video card is giving out?
I welcome all comments.

seems to only happen when I am charging my phone on it. I recently updated to a smartphone. Could that be the issue? Maybe not charge my phone with my computer? I hope someone can help.

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Has anyone else had screen flickering on iMac 27"?

I bought my 27" iMac only about one week ago, with the i7 processor, 8gb ram and 2gb graphics.
All has been fine, except every now and then the screen will flicker?
It happens every few hours I would say. It's never predictable, just happens and for about 10-20 seconds at a time.
Has anyone else had this issue? I'm waiting for my apple care to register so I can speak to someone about a replacement unit.
But for now I just thought I would ask and see if anyone else has run into this problem?
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FD

I have this same problem, Just bought a new imac 27".
When i'm scrolling in websites it's flickering. also when i slide to different desktops.
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i bought the iMac 18 months ago, had flickering @3 point brightness level, give it to the Mac store changed something and now got the flickerig at most of the brightness level. what could be the reason and whats the solution?

I'm sorry your phone was stolen dangphonestolen. I know its frustrating to be with out your mobile device and communication to friends and family. We are unable to send your phone a message of that nature. Just be careful to make sure your phone is suspended immediately afterwards if you choose to have a message sent to the phone so the person who has your phone won't incur any charges. Let us know if you have any questions about replacement options. We are here to help. KinquanaH_VZW Follow us on Twitter @VZWSupport If my response answered your question please click the "Correct Answer" button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!

Screen flickering on iMac (Yosemite) with Safari overload?

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Screen shot:
http://pbrd.co/17Y3FXz

Hello Hamper,
The article linked below provides a lot of great information and troubleshooting tips that you may not have already tried, which can help you resolve the Safari display issue on your iMac.
Safari 8 (Yosemite): Safari troubleshooting
Cheers,
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21 inch imac have any flicker problems?

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Have you already seen this thread?
http://discussions.apple.com/thread.jspa?threadID=2321490&start=0&tstart=0
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Hi, I'm a n00b here, I've read a handful of threads before posting this a I cant seem to find a definitive answer.
I have a 24" 2.4Ghz aluminium iMac and I've recently purchased a HP zr24w 24" IPS panel as a second display, connected with an apple miniDVI - DVI connector.
The screen flickers off, to totaly black every time the mac seems to be having a hard time doing something, be it fast scrolling, flash video, but someimes randomly.
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well, some time has passed, here's where I'm at so far.
I tried a friend's samsung 24" screen and all was good with the world, no flickering on and off, no black outs nothing, for days it was all fine. I swapped the HP monitor back on and it went right back to its old ways. I called HP tech support, they decided that the monitor was faulty, i returned it to where I got it from and they have sent me a new one. Which was fine, for about 7 hours!!
So, to recap, the mini-DVI to DVI adapter is fine as it worked on the samsung screen, the HP screen is brand new and exhibiting the exact same issue as the first one (cant be 2 faulty ones surely) The samsung screen was fine.
This leads me to think that there is some compatibility issue between the 24" imac and this particular (hp zr24w) monitor.
I have followed apple support's requests for data logging but they cant find anything wrong there.
I'm out of ideas, any help would be GREATLY appreciated !!!
thanks
Michael

Is anyone having flickering or visual noise issues with the latest 27" iMac (2012-13)?

Hi everyone,
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I'm using a Spyder3Pro with the new iMac and haven't run into problems. I did bring down the brightness three notches before calibrating - that LED is very bright.
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My iMAC 24; purchased in late 2008, the screen started flickering recently. Top half of the screen would flicker and the bottom half is black. The only option is to do a hard book by holding the power button. Now on the reboot I get the Apple icon and than the spinning gear but about 1 minute the gear stops. On some reboots I'm able to get in and everything is fine but than soon after the flickering starts up again. The strange thing is upon the reboot after the gear stops spinning it does seems to be still be running and the screen is just frozen. I saw post about a firmware update however I can't update the firmware because I can't boot up. I've tried booting from disk but I get stuck at the same spot. I tried booting in Safe Mode, I get the black screen with a lot of white text but that's it. The only possible error I see is, BootCacheControl: Unable to open /var/db/bootCache.playlist: 2 No such file or directory, but don't know what that means.
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PLEASE HELP!
My iMac 21" late -09, started acting a bit wierd a year ago. Things got worse rapidly, it got slower, the screen flickers/tears (see link below), short moments of lost internet connection, lost connection whit the keyboard (might be keyboard that is broken), almost overheats when gaming and odd behavior on some webbsites whit galleries and/or videos.
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No I didn't. The first time i explained the problem thoroughly and thought that they just couldn't miss such a visual error. I was wrong. The second time the technician wasn't there so i showed the above clip to the salesstaff and explained everything onceagain. Later the technician called me and we talked for 10min.
Btw, the problems always "manifests themselves", just varies between strenght and frequence.
But all other issues aside, what could cause the tearing of the screen as seen int the above clip?

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The screen flickers after I have been on the computer for 10-15 minutes. Back in January, the hard drive failed and was replaced. Is flickering a sign that the video display is about to die, or something less of a pain in the rear?

Unfortunately I cannot help, but I have the same issue. What I observe is that it tends to get better the longer the machine runs, i.e. heat becomes it. From Leopard to Lion the iMac would not go to sleep ever, only display sleep (black screen), but the rest would be running. During that time I hardly ever had any screen flickering issues. Only when I booted up after a prolonged period of rest (the machine, not me). Under Mountain Lion it seems it's gotten past its insomnia. So I have frequent screen flickering, but after some 30 minutes of activity it tends to bget better. But I seem to observe a slow digression. That's all I can say. My Harddisk was replaced years ago by an Apple Store. I am wondering whether it's financially wise to bother with an old machine like that. But I hate to throw things away...

TA25225 Display Flickers in my 21" Imac Intel. This happened after the fan noise in my machine. I also reported the problem and gave to the service centre, but the problem still persist. Please help. I purchased it 3 - 4 weeks ago

Hello,
I purchased my imac intel 21" 3-4 weeks ago and in the 2nd week i faced an issue with the machine. When i switched on in, there was a fan noise and a white screen. The machine had hanged. I reported the problem and gave to the service centre. After testing for a week, they said that there is no problem with the imac. Again i faced the same problem after receiving it from the service centre. They again tested the machine for 3-4 days and reported as no problem with the machine. Couple of days back, I received the machine from the service centre, and on the same day when i switched it on, there are flickers in the display. Please help me solve the issue. I am from India. The service here is very bad.
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Hello RedDevil07
Yes I agree with seventy one. It's common sense to do this, especially now. I would also contact AppleCare and report this issue with them, it will get documented and you will have a caseID that you can refer to when talking to them in the future should this issue go one.
Be polite with AppleCare and your AASP. Hopefully everyone is being honest and trying to help you and not what might appear to be the opposite.
Patience is a virtue, but I thoroughly understand your frustration.
Let us know how it goes, we are here to help in whatever way we can.
I encourage you to contact AppleCare to report this experience and get their recommendations. There is an expectation that you should have that AppleCare is there to help you as a customer. I am sure they will too!

Brightness/Flickering problem with left hand side of 2011 iMac display

Hi,
My 2011 iMac has recently developed a fault with the left hand side of the display flickering and being very dark. I've googled this and found that many other people seem to have this issue. As per other forum posts, if I apply a little pressure to the bottom left of the screen then this temporarily resolves itself, but this is obviously not a permanent solution.
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Sounds like it will be an international call (and sounds like you have all the local numbers), but you might try calling Cupertino and then ask for customer support
408-996-1010
Unless there were some repair program for this issue, if it's out of warranty, I doubt you'll get very far with it.

New iMac 27inch screen flickering/tearing/shutoff

I have been experiencing some problems with the all new iMac 27inch display.
At non-fixed intervals i will get one of the following:
Screen distortion/flicker somewhere random in the screen (feels like it is more in the lower part) that looks like a horizontal bar of about 2-3inches just popping in and out of the screen.
Screen will go completely black for a second and then come back on. Sometimes 2-3 times in a row.
Somebody else already made some video-clips about these problems, I am experiencing exactly the same behaviour.
http://www.youtube.com/watch?v=SjOxlxVz5Os
http://gallery.me.com/larzy#100025
Just to not that in the course of writing this post my screen has flickered 13 times and has gone black 2 times.

I received my 27" iMac three days ago and ever since i got it out of the box and turned it on it has done the same as the video shows.
Last night i watched a 30 min programme on BBC iPlayer and the 2-3 inch white lines kept popping up every few seconds horizontally across the screen. The screen also went black momenterally on 6 occasions.
I cannot believe after three days that this problem is so bad. I spome with Apple this morning on the Apple Care line and they told me to:
1. Shut down and take out power cord for 20 secs then turn back on.
2. Shut Down and then hold down "D" when turning back on which performed a hardware test...
Both had no effect.
Luckilly i am still within the 14 days of recieving my iMac and they are sending out a replacement but i am worried that this machine will have the same problems...
Is anyone happy with theres and is anyone not experiencing this problem... There seems to be a big issue here???

IMac display monitor problems, left side darkens and flickers

I have an iMac with 2.7 GHz Intel Core i5, 16 GB 1333 MHz DDR3, AMD Radeon HD 6770M 512 MB running Mac OS X Lion 10.7.5 (11G63). The last year the left side of the monitor was flickering intermittingly. I didnt think much of it. Then in July, one big flicker caused the left side of the screen to darken slightly. Fortunately, my AppleCare was still in effect,. I contacted Apple and they had me zap the PRAM and also reboot into Recovery mode. The darkness was still apparent. So I took it to an authorized dealer and they fixed the display. Now tonight, one big flicker happened and I noticed that the left side had darkened a little again. I zapped the PRAM and it seems to be ok now, but I'm afraid that the same thing will soon happen. And of course the AppleCare has expired finally. Has anyone encountered this? I have four external hard drives on a shelf right next to the display. This sounds silly, but could they be affecting the display in any way? I moved them a few feet below where they were, hoping that they werent the cause of the problem.
Any advice would be most welcome.
Thanks!

had zapped pram not helped then I would had said that the lcd panel itself was close to the end of it's life and replacement would be required but since it did then I have no real cause to believe the issue would come back

New 27" Thunderbolt Display Flickers when attached to new 27" iMac

I'm using a new 27" iMac. I require a dual-monitor configuration so yesterday I purchased a new 27" Thunderbolt display and plugged its built-in Thunderbolt cable into the Thunderbolt port of the iMac. I now have a huge desktop space that spans two monitors. With that in mind…
At least once every few minutes the new Thunderbolt display blacks out (i.e. flickers) for approximately one second. The symptom is very similar to what a Windows-attached display does when the screen resolution is changed. A quick Google search indicates others are experiencing the same problem although most complainants are using a MacBook or Mini, not an iMac.
Apple posted a firmware update for the Thunderbolt display a few days ago. I installed it successfully but the problem remains. Any advice?

UPDATE:
I received a call back from a senior tech at Apple. The salient points are as follows:
(1) Apple engineers are well aware of the problem.
(2) They plan to release a firmware update for the display at some indeterminate time.
(3) The fix for this problem will not be bundled into the forthcoming 10.7.2 Lion update.
Given that the flickering problem renders the Thunderbolt monitor virtually unusable as a desktop extension for a 27" iMac, combined with the fact that Apple has no idea when a fix for the problem will be available, my decision to return the monitor for a full refund is a virtual certainty.
AppleCare objected to my conclusion that the Thunderbolt monitor is "incompatible" with the iMac. Perhaps they're right. I'm not super technical so it's possible that I used the wrong term. It's a semantic distinction though. The bottom line is that Thunderbolt displays flicker when attached to a brand new 27" iMac and my personal opinion is that one is better off not purchasing this device until Apple fixes this major flaw.
Apple asked me to make a video of the Thunderbolt display manifesting the problem. Here it is.
http://www.youtube.com/watch?v=k-UCGGkSciI
Hopefully this information will be of value to someone.

Flickering 24" iMac

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