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  • Brian Ibbott Level 1 Level 1 (0 points)
    It's not just happening with iMac, either - it's happening on my 2006 2.33GHz Intel Core Duo MacBook Pro. EXACTLY like the photos below, with the 3D warping, random lines and instant black shutdown.

    Running SMC does appear to help, although I've had the problem happen a lot lately when recording via ScreenFlow.
  • wirre Level 1 Level 1 (0 points)
    My horizontal lines are gone in 10.6 (286) beta ?! i hadd to speed up the fans in 10.5, but it didn´t help. Tried to install 10.5 server, the issue was almost gone there, but with 10.6 there is no horizontal lines at all. The fans now runs at default speed.
  • travis.collins Level 1 Level 1 (0 points)
    I'm in the same boat, random horizontal lines & some screen tearing(?).

    Since 10.5.7 is out, I thought energizing this thread might prompt some feedback from those affected by this issue. I'll try when I get home and report back.

  • crivel Level 1 Level 1 (0 points)
    Ok, I read ALL of this thread and some others, MacInTouch too (yeah, well, prebabyboomer or pbb for short, I can find the time...)

    Model Identifier: iMac5,1
    Memory: 2.5 GB
    Boot ROM Version: IM51.0090.B09
    SMC Version (system): 1.9f4

    Before installing 10.5.7 I did not encounter the issues reported. However, if this is heat related ...well, just that little more dust may have accumulated and the problem might show no matter what OS version…

    I saw:
    - horizontal lines streaking across app windows (browsers Safari 3.2.1, Camino 1.6.7), or appear in multiples on the desktop (white, black, coloured 1 px wide, I guess.);
    - on one occasion a pinkish/orangish rectangular quasi-triangle (fades direction lower right) showed up top of screen, approx. middle third.
    - and then there were distortions, especially in browser windows with window portions getting stretched that what's normally band-like becomes triangular in shape;
    - also, over the last several months it did seem my iMac got sluggish, the beach ball twirled, and there were app window freezes, tho' never a grey screen and very, very rarely a kernel panic.

    When the machine is restarted after a shutdown lasting *several hours*, no such lines. Using a FW connected external drive to restart from while machine is warm: problems occur.

    Hardware test with Tech Tool: nothing wrong.

    I tend to think, it is heat-related and the heat build-up is dust-related and the heat of course is due to processor intensive jobs.

    Meanwhile I use smcFanControl to get a better air flow, temps typically ±38˚C.

    I also disconnected at one point all periphery (except kb, mouse), used a different DSL modem, started up from an external drive -- warm machine: trouble; cool machine (morning): no problem.

    For the last 4 hrs smcFanControl is running now (freshly encountered and installed thanks to this discussion here). Noh moh problems.

    I made one smcFanControl setting to max the three fans (out of curiosity), turned them on (yes, you do hear them) and a puff of dust got blown out a the top right front of the screen of my white iMac. Might be worth it to get at the reminder of the dust inside. Laborious tho', and tricky to get to the heat sink mentioned in one post. Best talk to my independent repair shop rep-it here (CH).

    35 C = 95 F currently and all is fine.
  • darrickF Level 1 Level 1 (0 points)
    If it's indeed dust related then Apple should offer free cleaning for machines affected(apple care or not). I certainly didn't spend $2,000.00 to beta test their hardware design.

    I'm still dealing with this issue and it's so dang annoying. It's interesting to me that aluminum iMacs are also being affected -- would Apple knowingly carry over a design flaw if it only affected a small portion of users(us)... ask their business unit.

    Thin is nice and all but a machine that WORKED would be nicer.

    Apple, you're about to have one less fanboy if you don't do something about this.
  • wdgreen Level 1 Level 1 (0 points)
    I need to include my late 2006 24" iMac as a casualty. I was told by apple support to do an HD wipe and install. I did, and afterwards I still had multiple lines and frequent freezes. I also removed some 3rd party RAM that was thought to be the culprit and put back in the original RAM that came with the imac, and it helped, but it far from solved the issue. Apple is (usually) such a great company. I wish they'd make this right.
  • Brackynews Level 1 Level 1 (0 points)
    Just adding my voice to the choir of video glitches. 20" iMac5,1; Core 2 Duo 2.16 GHz. Just noticed the issues within the last few months (10.5.6).
    Just installed SMCFan and can't believe how much the temperature has cooled off. Will see how it lasts the rest of the year before my AppleCare runs out.
  • thelastslumgoddess Level 1 Level 1 (0 points)
    it gets worse too.

    it's the gift horse that keeps on ticking & kicking.

    now i sometimes also get weird visual crashes, as if everything is smushed into dying diagonals massed from a wrecked & in color horizontal hold. i hope that makes sense. if you picture it--better, if youve also seen it--it probably does.

    has heat been decided as the main culprit?

    the new OS?

    i still get the stupid one pixel horizontals & the flashes of semi-fluorescent isocel-ish triangular semi-rectangles in pinks & yellows.

    WHAT is the solution?

    IS THERE a solution?

    besides pitching a machine i ABSOLUTELY cannot afford to pitch, i mean.

    aidez-nous, s'il vous plait pomme?
  • Leidon Level 1 Level 1 (145 points)
    Wow! Guess I'm not the only one with this problem. My iMac 20" GHz/1.5G/OS10.5.7 just started getting really bad with all the 3D, lines & color freezing. I will try the Fan app and see how that works.
  • bk1000 Level 1 Level 1 (35 points)
    I'm now having the same issue. Horizontal lines and some weird ghosting. It's out of warranty (20" white 2.16GHz Intel iMac). Apple ran overnight diagnostics. Diags said HDD is failing, but that wouldn't produce the screen issues. Said that the screen issues are the video card failing and that the whole board has to be replaced: $900.

    I installed SMC Fan Control, and the fans are kicking up higher now. No more glitching, but it's only been a couple of days so far, so I'll wait and see. If I can get to the end of the year before the video card (or the fans) die, I'll be happy.

    The issue with the white iMacs is universal apparently (Googled the issue -- hits are massive). It seems to be heat related, and a poor design for heat dissipation.

    For those in Boston, Computer Loft in Alston will do the repair much cheaper than Apple, but still -- this is a design issue, and Apple should have a better solution.

    Lesson learned -- I will never buy an iMac again without applecare, and will sell before it expires.

    Message was edited by: bk1000
  • steuber Level 1 Level 1 (0 points)
    Same issues with my Intel 24inch iMac. Called Apple Care today, and we did some basic trouble shooting. Problem still there. I could call for a third time, but I think I am going to take it to a local apple reseller... see if they will fix it. Good thing I bought Apple Care. I'll report back with a status update.
  • Kilometer Level 1 Level 1 (0 points)
    Same problem. 2.16 white iMac, 256 mb VRAM. I should be getting the machine back today from Apple (replacing HD, LCD, Logic Board). SMCfan was working for me previously but my AppleCare is about to end so I thought it would be a good idea to take it in anyway. If it happens again it's going right back to Apple. I think once you get to three system overhauls they call your machine a lemon and give you a new one (happened with my Mac Mini).
  • Bixmen Level 1 Level 1 (25 points)
    Same problems with me, as well. 2.0ghz Intel core 2 (non duo) iMac. it's happened for the past 6 months or so. Upping the fan speeds helped.

    What bugs me more, is I was getting ready to think about upgrading this computer. but if new iMacs are doing this too, what is there to upgrade to? it really bothers me that there is no affordable desktop mac that isn't a lemon, yet decently powerful.
  • tyc314159 Level 1 Level 1 (0 points)
    horizontal lines too
  • Bixmen Level 1 Level 1 (25 points)
    For me, the problems didn't really seem to start until I installed Leopard. Now that I have snow leopard, it didn't seem to help... Back to SMCFan Control...

    Anyone else have a more PERMANENT fix?
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