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New iMac 27inch screen flickering/tearing/shutoff

453380 Views 4,486 Replies Latest reply: Feb 9, 2010 6:59 AM by Brett L RSS
  • Warren Beasley Calculating status...
    dxgriffiths wrote:
    Guys, one thing I did notice after applying the second update is that the image quality seemed to be different.

    In particular, when dragging a window around (say, Safari or Finder) the thick grey title bar would noticeably change to almost a meshy look, as if there were thousands of tiny crosshatching lines on it. When the window stopped moving, it'd go back to being smooth grey again.

    I tested this several times and knew that it was a fresh development. In general the screen just also seemed less responsive as if the screen was being painted less often.

    Can anyone with the second update confirm whether or not you see these slight artefacts with the grey areas moving around onscreen? It'd be interested to see whether it was just on my iMac or if others can see it too.

    I realise that no rush technology fix is likely to be magic and that Apple conceivably "turned down the awesome" on their display firmware to stop it from flickering... But given that the screen also now doesn't look or feel as good that makes me feel a bit bad.

    What I'm trying to say is, in the rush to celebrate not having flickers have you actually looked closely to see ifthe screen really looks as good as it did? I do believe mine lost a certain degree of smoothness and the meshy greys were very noticeable, since I rearrange my windows a lot and they basically turned etchasketchy in a way I've never seen before.


    Hello DXGriffiths,

    I find it very interesting that you should bring that up, because on February 1st, I asked similar questions in the yellow tinge thread. I pondered what kind of negative effect these firmware updates might have on the overall performance of our iMacs.

    Following is a copy of my original post there:

    ===== Begin Quote =====

    Here is a question for those of you who may be more technically savvy than myself.

    Assuming that Apple is able to create a firmware fix for the screen flicker and/or the yellow tinge, and assuming that this fix is some kind of post processing mechanism, considering the size of these LCD screens, do you think that the fix might have a negative effect on some of the other processes which are involved in drawing the screen? More specifically, I am wondering if borrowing from Peter to pay Paul might:

    1. put added stress on the LCD panel.

    2. slow down screen-drawing, even if it imperceptible to the human eye.

    3. in the long run, shorten the life of the LCD panel.

    As I said, I am far from a technical wiz, but if, for example, the approach that Apple takes were to be something like trying to recalibrate every single defective pixel or sub pixel that is not displaying the proper color -- the yellow tinge -- so that we see white as white, and not as dirty white or yellow, it seems to me that it would place a heavy burden on the processors, as well as on the LCD panel itself.

    Alright you techno giants . . . go ahead and tell me that I don't know what I am talking about. I probably don't.

    ===== End Quote =====

    And now we have a second person -- Skypeable -- making similar comments to your own, DXGriffiths.

    That is now two people who have noticed a deterioration in the quality of -- or performance of -- their machine. Are these two people just imagining things, or is what I dreaded/suspected actually coming to pass?

    Thankfully, I have yet to install the display update; and based on comments from these two people -- DXGriffiths and Skypeable -- I am now even more inclined to not install the second update.

    I haven't experienced a single flicker since January 21st when I first received this machine -- 19 days -- so why bother with it? Of course, my concern is that in some upcoming update, Apple might possibly surreptitiously slip in the display update unbeknownst to us, if they are convinced that everyone should have it installed. After all, it appears that the latest machines already have BOTH updates pre-installed, right? So by their actions, Apple is basically saying "You really need these two updates, whether you realize it or not." The newest iMac owners have no choice in the matter.

    Adios democracy! Hello techno-dictatorship!
    2.8 GHz Quad Core i7 iMac / 8 GB RAM / 2 TB Hard Drive, Mac OS X (10.6.2), (1) Iomega 1 TB eGo USB Drive / (1) Pioneer 111D External DVD Burner
  • Haydude Calculating status...
    Hello everyone! I bought my Dad the 27" Quad-core i5. Received it Jan. 3 2010. Serial Number W89526xxxxx. I helped him set it up and left his house to let him play with his new toy running iTunes and three hours later it shut down. He said it was VERY HOT at the top of the case.
    There is a thread in the Mac Pro forums pertaining to Nehalem's overheating while working in iTunes, and shutting down when reaching thermal maximums. It is a large thread also.
    I have scanned this thread by nine page jumps and have not seen anyone doing temp. monitoring/ power consumption while in iTunes.
    The focus has been on the screen here, has anyone done temp. readings, while in various audio programs?
    Apple is just now admitting to the Mac Pro heating problems, and the i5 is a Nehalem based processor.
    Is the flickering screen a subset problem to this Nehalem heating problem, which shut down my Dad's 27' i5?
    Single 1.8 Ghz G5, Dualcore 2.0Ghz G5, Mac OS X (10.4.8), Dual 23" HD ICE Displays
  • Warren Beasley Level 1 Level 1 (0 points)
    Currently Being Moderated
    Feb 8, 2010 2:49 PM (in response to Haydude)
    Hello HayDude,

    I occasionally monitor my temperatures using iStat Menus. I like it much better than iStat Pro, because it doesn't clutter up the desktop.

    At any rate, as I've mentioned before, in the 19 days that I have had this machine, I have rarely ever seen the temperature sensors peak above 150 degrees Fahrenheit. They usually hover in the 140's, or lower.

    Normally, I don't use iTunes, as I find it a bit too bulky for my taste. I much prefer the light feel of Vox 0.2.7b1, which sits in the lower right corner of my screen. Even when I play music for hours in Vox, my i7 Quad Core iMac does not overheat. It remains in the temperature range noted above.

    On the other hand, I do have the yellow tinge, as well as some dead pixels, but no flickering or blackouts in the 19 days that I've owned this machine. I never installed the display update.
    2.8 GHz Quad Core i7 iMac / 8 GB RAM / 2 TB Hard Drive, Mac OS X (10.6.2), (1) Iomega 1 TB eGo USB Drive / (1) Pioneer 111D External DVD Burner
  • Howard Bornstein Level 1 Level 1 (35 points)
    Now that things have apparently settled down with the 27" iMacs, I'm ready to order one. However, I was surprised to see this statement on Apple's Refund policy page: "You have up to 14 calendar days from the time you receive your item(s) to initiate a return. A 10% restocking fee will be assessed for opened items."

    It doesn't even say a fee "may" be assessed. It says it "will" be assessed. However I don't recall any of the many people on this thread who returned their iMacs indicating they paid a restocking fee. I'd like to know if anyone did get charged this fee from Apple when they returned their iMacs.
    Dual 2GHz PowerPC, MacBook Pro, Mac OS X (10.5.8)
  • Dino1956 Level 1 Level 1 (40 points)
    Howard, No we did not pay Restocking Fees for Exchanging Our Defective iMacs. But I have some Advice! WAIT! There are still iMacs being made just last week that have the Yellow Tinge Screen Defect. If I were you, I'd wait to order at least until March & buy from Apple Online. As stores may still have older defective stock. Just my advice & opinion. If you read the last 5 Pages of this Thread, you will see people are still getting Yellow Screens.
    Mac Mini 1.83 Intel Core 2Duo 2GB Ram, Mac OS X (10.6.2)
  • Howard Bornstein Level 1 Level 1 (35 points)
    Currently Being Moderated
    Feb 8, 2010 5:04 PM (in response to Dino1956)
    I understand you advice, Dino, as I've been closely following this thread. Unfortunately, I've been hobbling along on my G5, which is now precipitously circling the drain. If I didn't need a replacement immediately, I'd wait until March to see what the expected refresh of the iMac line would bring, but my current computer is about to bite the dust and I can't afford to wait any longer.

    It looks like the flicker problem is under control, and while the yellow tint problem still is showing up, it seems the frequency is being reduced. So, based on that, I will take a chance and hope for the best. I have an Apple store within 10 minutes of me so I can get quick support if I need it.

    My order is showing a ship date of Feb 23rd. and I did order from the Apple online store.
    Dual 2GHz PowerPC, MacBook Pro, Mac OS X (10.5.8)
  • Warren Beasley Level 1 Level 1 (0 points)
    Howard Bornstein wrote:
    Now that things have apparently settled down with the 27" iMacs, I'm ready to order one. However, I was surprised to see this statement on Apple's Refund policy page: "You have up to 14 calendar days from the time you receive your item(s) to initiate a return. A 10% restocking fee will be assessed for opened items."

    It doesn't even say a fee "may" be assessed. It says it "will" be assessed. However I don't recall any of the many people on this thread who returned their iMacs indicating they paid a restocking fee. I'd like to know if anyone did get charged this fee from Apple when they returned their iMacs.


    Settled down? I would agree with Dino . . . not exactly settled down just yet.

    *So say we all!* (Yeah, I'm a big BSG fan!)

    According to all of the posts that we have been reading in this and other threads, Apple's actual actions with owners of defective iMacs has been quite different from what is stated in their return policy, which is as it most definitely should be.

    In other words, in my view, it would be highly immoral for Apple to charge ANY defective iMac owner a restocking fee. After all, THEY sent us the defective iMacs.

    On the other hand, if someone wishes to return an iMac -- or any Macintosh for that matter -- for any other reason than an obvious factory defect, then I suppose that, like most other businesses, they have the right to charge a restocking fee . . . although considering how much we pay for these machines, 10% is outrageously high in my view.
    2.8 GHz Quad Core i7 iMac / 8 GB RAM / 2 TB Hard Drive, Mac OS X (10.6.2), (1) Iomega 1 TB eGo USB Drive / (1) Pioneer 111D External DVD Burner
  • Warren Beasley Level 1 Level 1 (0 points)
    Howard Bornstein wrote:
    . . . and while the yellow tint problem still is showing up, it seems the frequency is being reduced. So, based on that, I will take a chance and hope for the best. I have an Apple store within 10 minutes of me so I can get quick support if I need it.


    Reading these various threads, I haven't noticed any reduction in the yellow tinge problem; or maybe it's . . . "just my imagina-a-tion, running away with me." -- The Temptations, 1971.

    Going by the latest posts, I'd say that you are still taking a big chance; but it is YOUR money, and thus YOUR call.
    2.8 GHz Quad Core i7 iMac / 8 GB RAM / 2 TB Hard Drive, Mac OS X (10.6.2), (1) Iomega 1 TB eGo USB Drive / (1) Pioneer 111D External DVD Burner
  • Dino1956 Level 1 Level 1 (40 points)
    Warren,
    I'm glad the Apple Tech that I sent the Picture of my Yellow screen to, didn't Sing Me that Song to me after he got my Picture! L.O.L.
    Dino
    Mac Mini 1.83 Intel Core 2Duo 2GB Ram, Mac OS X (10.6.2)
  • Howard Bornstein Level 1 Level 1 (35 points)
    Reading these various threads, I haven't noticed any reduction in the yellow tinge problem;


    According to imac.squeaked.com, the reports for yellow screens are down from 17 in week 4 to 3 in week 5. Admittedly, it may be too soon for accurate reports from week 5, but I simply cannot wait anylonger to replace my G5.
    Dual 2GHz PowerPC, MacBook Pro, Mac OS X (10.5.8)
  • Warren Beasley Level 1 Level 1 (0 points)
    Howard Bornstein wrote:
    Reading these various threads, I haven't noticed any reduction in the yellow tinge problem;


    According to imac.squeaked.com, the reports for yellow screens are down from 17 in week 4 to 3 in week 5. Admittedly, it may be too soon for accurate reports from week 5, but I simply cannot wait anylonger to replace my G5.


    The problem with relying upon imac.squeaked.com, or any related statistics sites, or even the posts that are found in these threads, is that they offer such a small sampling of the total number of people that actually experience these problems, that none of us can really accurately determine the actual scope of these problems.

    As has been pointed out before, many people with defective iMacs are not even aware of imac.squeaked.com, or of these threads. Thus, unless every single person who has been affected by these problems posts here, or submits their details to imac.squeaked.com, we have a distorted view of what is going on.

    In my view, it is foolhardy to extrapolate, based on the limited data that we have.

    The only thing that remains certain, is that some of these problems clearly continue to exist, and that new people continue to find these threads all the time.

    What is also certain, is that Apple is the only one who knows the real statistics, and they aren't talking.
    2.8 GHz Quad Core i7 iMac / 8 GB RAM / 2 TB Hard Drive, Mac OS X (10.6.2), (1) Iomega 1 TB eGo USB Drive / (1) Pioneer 111D External DVD Burner
  • Dicebier Level 1 Level 1 (0 points)
    Warren Beasley wrote:
    Howard Bornstein wrote:
    Reading these various threads, I haven't noticed any reduction in the yellow tinge problem;


    According to imac.squeaked.com, the reports for yellow screens are down from 17 in week 4 to 3 in week 5. Admittedly, it may be too soon for accurate reports from week 5, but I simply cannot wait anylonger to replace my G5.


    The problem with relying upon imac.squeaked.com, or any related statistics sites, or even the posts that are found in these threads, is that they offer such a small sampling of the total number of people that actually experience these problems, that none of us can really accurately determine the actual scope of these problems.

    As has been pointed out before, many people with defective iMacs are not even aware of imac.squeaked.com, or of these threads. Thus, unless every single person who has been affected by these problems posts here, or submits their details to imac.squeaked.com, we have a distorted view of what is going on.

    In my view, it is foolhardy to extrapolate, based on the limited data that we have.

    The only thing that remains certain, is that some of these problems clearly continue to exist, and that new people continue to find these threads all the time.

    What is also certain, is that Apple is the only one who knows the real statistics, and they aren't talking.


    I agree, and conversely the are antagonists that double and triple etc posts to these forums to try to inflate the issue even further for their own amusement. Only Apple knows for sure. Heck, there might be a bunch of PC fanboys out there just posting problems for fun.
    27" iMac i7 950 Production, 17" 2.66 MBPro, 32 GB iPhone 3GS, 8 GB Iphone 3G
  • Dino1956 Level 1 Level 1 (40 points)
    Currently Being Moderated
    Feb 8, 2010 8:25 PM (in response to Dicebier)
    Any of us who have been reading this thread for the last couple of months & exchanging 3 iMacs in a row with problems, would have to say that this is a much bigger percentage of defective iMacs than we had thought at first. How people from all over the Globe can get 3-5 iMacs in a row that are defective in one way or another & then people turn around & say that it is very low percentage is beyond me. I think about the people who have their iMacs & don't even know they have Yellow tinge. On some iMacs, it's not that obvious. We can't all be that unlucky.
    Mac Mini 1.83 Intel Core 2Duo 2GB Ram, Mac OS X (10.6.2)
  • Bamtan Level 1 Level 1 (0 points)
    Hadn't experienced any flickering up until last Friday.

    OSX is perfectly fine - never seen one flicker. However on Windows there's a slight flicker, not as severe as some of the videos I've seen, but it's every few minutes or so.

    I'm thinking perhaps the graphics driver update in December fixed any issues on OSX, seeing as I've never seen it flicker while using it. However on Windows 7 I'm using the default ATI driver, due to the colour banding with the Boot Camp drivers. Could it be just a case of waiting for the next Boot Camp release to fix this? Or is it a problem worth escalating to get a replacement?
    27" i5 iMac
  • matthew burke Calculating status...
    Recieved my i7 imac today 2 days early and it is incredible. There is not dead pixels on the screen or the isight camera. The disc drive works as it should and the system is whisper quiet. There may be the slightest hint of yellowing on the screen but I HAVE to have the grey bars on to see it and even then I have to look for it. Im not stressing over it in the least bit. I have been throwing everything I have at this computer all day long and I cant seem to slow it down in the least bit. Very happy with my purchase and the wait was well worth it.

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