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Jan Sampermans
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Q: 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.

iMac 27inch 3Ghz 4GB 1TB ATI 4670, Mac OS X (10.6.1)

Posted on Oct 27, 2009 3:56 AM

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Jan Sampermans

Q: New iMac 27inch screen flickering/tearing/shutoff

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  • by MarkyJ,

    MarkyJ MarkyJ Nov 29, 2009 4:56 PM in response to Leisas4
    Level 1 (0 points)
    Nov 29, 2009 4:56 PM in response to Leisas4
    Leisas4 wrote:
    Got my 27" I5 on Friday, announced DOA this morning Monday


    Can you post your batch number? It is the first part of your serial number, i.e. W8946 is week 46.

  • by loofah,

    loofah loofah Nov 29, 2009 5:11 PM in response to Jan Sampermans
    Level 1 (0 points)
    Nov 29, 2009 5:11 PM in response to Jan Sampermans
    yup, today i turned my imac on, and the screen is now flickering every other minute, and I've had it go black for a brief second about 3 times in the last 20 minutes. This *****. With Applecare, can I just take it to the store and get a new one or what?

  • by John Trussell,

    John Trussell John Trussell Nov 29, 2009 5:12 PM in response to loofah
    Level 1 (10 points)
    Nov 29, 2009 5:12 PM in response to loofah
    Yes, keep exchanging it until you get one that works!! I've had to do it 3 times until I finally found one that is perfect.

  • by Leisas4,

    Leisas4 Leisas4 Nov 29, 2009 5:18 PM in response to John Trussell
    Level 1 (0 points)
    Nov 29, 2009 5:18 PM in response to John Trussell
    yes first part of serial is W8946****

  • by gr8fl4295,

    gr8fl4295 gr8fl4295 Nov 29, 2009 7:21 PM in response to Jan Sampermans
    Level 1 (1 points)
    Nov 29, 2009 7:21 PM in response to Jan Sampermans
    I'm having the same problem now.
    I just got my i7 back from Apple repair.
    I had the grinding noise problem AND a burnt out pixel.
    Apple repair fixed the fan noise and replaced the screen.
    But now I'm having this issue.
    Serial starts with W8945.
    I can't believe I have to take it back into Apple tomorrow to have it repair again!!!
    This machine costs WAY too much for having these problems.

  • by samt14,

    samt14 samt14 Nov 29, 2009 7:29 PM in response to gr8fl4295
    Level 1 (10 points)
    Nov 29, 2009 7:29 PM in response to gr8fl4295
    Mine is W8947, no problems, i even ran itunes visual thing while playing music for an hour and had no problems. I really don't think it's a hardware issue, but more so a driver issue that effects certain cards. Keep ******** at apple and they'll force the manufacturer to fix the problem.

  • by loofah,

    loofah loofah Nov 29, 2009 9:21 PM in response to Jan Sampermans
    Level 1 (0 points)
    Nov 29, 2009 9:21 PM in response to Jan Sampermans
    mine was running fine for about 2 weeks, then today I startup, and get a barrage of flickering and momentary black screens. This gets annoying real quick. Need to get this thang to apple.

  • by Simon (UK),

    Simon (UK) Simon (UK) Nov 29, 2009 11:33 PM in response to loofah
    Level 4 (3,573 points)
    Mac OS X
    Nov 29, 2009 11:33 PM in response to loofah
    The new iMacs are not the first to use the 4850 GPU. It was made available last May as an option in the 24" models.

  • by simoxmino,

    simoxmino simoxmino Nov 30, 2009 12:35 AM in response to Simon (UK)
    Level 1 (0 points)
    Nov 30, 2009 12:35 AM in response to Simon (UK)
    hi mate.. my imac 27" i7 8gb arrived wednesday is ok!! no flickering no other..

    is a w8947... but there is a percentage of the iMac failed? and why of this problem? gpu? cpu? ram?

    what happens?

    bye!!

    simone

  • by ellsmako,

    ellsmako ellsmako Nov 30, 2009 3:38 AM in response to samt14
    Level 1 (0 points)
    Nov 30, 2009 3:38 AM in response to samt14
    While I would like to think driver,... BUT only shows up on certain card is a stretch, since that would mean hardware, anyway thats just spliting hairs isn't it ? I have not read all posts ( just most of them ) so far I think 947 looks good but again some people get the problem weeks after so I like most people have no clue as to whats wrong so keep exchanging until either a software or hardware fix is implemented. bunch of stuff now wondering.

    Shipping ( being banged around ,"no shock sensor strickers " )
    Model buuild date
    Electrical
    added software ( although some are problem right out of the box )
    migration issues etc

  • by JiminSF,

    JiminSF JiminSF Nov 30, 2009 4:03 AM in response to Jan Sampermans
    Level 1 (4 points)
    Peripherals
    Nov 30, 2009 4:03 AM in response to Jan Sampermans
    Uggghhhh. Back to using Windows laptop now, so painful by comparison, but afraid to order another iMac until I hear that they figured out what was causing this.

    I've gotta figure a lot of people have heard about this at this point and that Apple would want to let it be known they found and corrected this, but who knows, maybe their sales are so good it doesn't matter. {Sigh}

  • by PeterBreis0807,

    PeterBreis0807 PeterBreis0807 Nov 30, 2009 4:25 AM in response to JiminSF
    Level 8 (35,830 points)
    Mac OS X
    Nov 30, 2009 4:25 AM in response to JiminSF
    It seems everyone has heard of this except Macworld!

    Even my local newspaper.

    It will suddenly become a "story" for Macworld when Apple fixes this.

    Should be retitled MacPravda.

  • by starocker,

    starocker starocker Nov 30, 2009 4:20 AM in response to Jan Sampermans
    Level 1 (0 points)
    Nov 30, 2009 4:20 AM in response to Jan Sampermans
    Mine is W8948, now flickering...

  • by Ricardoric,

    Ricardoric Ricardoric Nov 30, 2009 4:21 AM in response to PeterBreis0807
    Level 1 (0 points)
    Nov 30, 2009 4:21 AM in response to PeterBreis0807
    I've ordered a 27" i7 with 8GB. Got the invoice today and its showing serial as W8948xxx which i'm guessing is a week 48 ?

    Having read all the screen cracked/doa/flicker problems here's hoping that it turns up and works. This is my first Mac and I hope the experience is a positive one!

  • by xxjackyxx9,

    xxjackyxx9 xxjackyxx9 Nov 30, 2009 4:22 AM in response to Jan Sampermans
    Level 1 (0 points)
    Nov 30, 2009 4:22 AM in response to Jan Sampermans
    im having the same problem too... but i did a PRAM reset, it seems fine for now...
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