Previous 1 4 5 6 7 8 Next 115 Replies Latest reply: Oct 9, 2010 9:42 AM by Dave13 Go to original post
  • Luke Noel-Storr Level 1 Level 1 (25 points)
    Well, as my warranty was about to run out I finally lugged my iMac into an Apple Store to get it looked at. They replaced the logic board and graphics card/chip and it's now running swimmingly (seems faster than ever - though that could just be the fresh install of Leopard, when I had a cludgy old Tiger on there before). The problem has gone (but for how long?).

    They also put a new LCD panel in, though that was really for a different issue.

    They gave me a receipt which included all the costs I'd have had to pay if it wasn't covered by my warranty still, an it would have come to about £450 (excluding the LCD, which was another £350).

    I wish I'd got it done sooner, as my machine had been basically unusable for so long. I think it would even have been worth paying the £450 to get it sorted (even though that's about half the price of a new iMac). It wouldn't have been worth the full £800 for the LCD too though, as that's only a couple of hundred away from a new iMac.


    It's a shame there's been no official recognition of this error from Apple though, and the guys in the store hadn't come across it before it seemed.
  • cbergstrom Level 1 Level 1 (0 points)
    I've got this problem as well on my 2.16 GHz Intel Core 2 Duo. Smc helped for a while, but now the horizontal lines are back with a vengeance, even with the machine running at 26 degrees C.

    Doesn't seem to be temperature - or at least not temperature alone - that was causing the problem.
  • Akjim Level 1 Level 1 (0 points)
    I have had the horizontal tearing issues for the last 6 months or so but have no warranty. I went through the SMC fan control solution and it helped for a while, but every other session on the iMac results in horizontal lines or lockup ( black screen) or lock up with mouse control requiring hard restart.
    I loved the computer and was an apple advocate but now I tell people about this when they ask about my apple...any real solutions would be appreciated.
  • Part time sysadm Level 1 Level 1 (0 points)
    ok ok ok. Me too. All the same problems. Most recently I weather stripped the windows in my wife's office and the problems escalated to a point of inoperability. I had suspected heat for a long time - cause the problems would occur at night while watching TV on the mac. But after reading this thread, weather stripping the office and buying (YES BUYING) a new iMac27 finally brought me here. 4 Macs, 2 iPhones, 4 iPods and and all I have now is 5 nasty words for Apple (I love your stuff LESS) today. I have a mind to return the new iMac27 and will sit on it for 24 hours as to not act too rashly. And yes - installed smcFanControl and can hear the fans for the first time. Temperature has dropped from 105F to 79F since installation 30 minutes ago. The theories about Bluetooth mice and boards seems possible and clearly graphic intensive operations TV and iPhoto all contribute. But for me it was the warmer room caused by the weather stripping on the windows that cemented deal. Seem our iMac was under the basement window and had fresh air until I fixed the problem - so to speak. Unrelated problem of not being able to install Snow Leopard on this machine for some reason - 'Snow Leopard can't be installed on this computer'. Tried 3-4 different approaches and still wont' work.
  • Part time sysadm Level 1 Level 1 (0 points)
    I'm keeping the iMac27 and certain that I still have heat related problems with this iMac24. Hung for me this evening - even after successfully installing Snow Leopard. I'm thinking this machine is only good for email and a few other things - perhaps I'll give it to the kids. And to the folks at Apple-you really need to confess what you know about this problem. I have mac in my attic that were more reliable that this one. If a car manufacturer had this type of problem they would be forced to recall it.
  • TMeck Level 1 Level 1 (0 points)
    Same Problem, Definitely started after installing Snow Leopard... Here's something I can offer that others have touched on the subject of heat. I have 5 iMac's in the same office with the same hardware/software configs and all have the Latest updates and firmware....Only 2 of them have this problem. Same temp/environment as the others so I'm not thinking that is it, also it's not "just" showing up on the display as it shows up on screen captures as well as QT movies if it happens while exporting from FCP? Had a Hard drive fail in one of the 2 with the problem and used the opportunity to start from scratch with the rebuild... Same thing once it was back up and running again???
  • MacLoyal Level 2 Level 2 (255 points)
    This is happening to me with my MacPro, 6 months out of my APP on a mostly rebuilt computer. I'm having lines and screen freezes. I'm also having some bizarre behaviors with my menu bar at the top. Just the other night I opened Aperture and the menu continued to show Finder values. I had to click across each word and then into the blank spaces to the right one by one to get the menu for Aperture to appear. I hadn't connected all these strange behaviors before reading this thread. I wish someone had posted a definitive answer to what's going wrong here.
  • Phil Gribbon Level 1 Level 1 (5 points)
    Same story as everyone else here, but with a happy ending.

    After a long time limping along trying to get things cooled down with SMC Control, the iMac started glitching and freezing almost immediately after startup. It seems that once the graphics chip starts glitching like that, it's the heat sink that takes the battering. It's a matter of time until the machine is bricked.

    I took mine in to http://applerepairsinlondon.co.uk and asked them to fix the chip. They claim to fix component parts of the logic board, rather than replacing the whole thing. They rang the next day to say that they'd need to do the heat sink too as it was pretty much gone.

    Excited, I went in to pick it up, only to find that it was displaying pretty much the same problems. They said it was because of dead pixels and I'd have to replace the screen. Bollocks, I said.

    I gave them another day to think about it, and they replaced the cable that connects the logic board to the screen and voilà, no more glitches.

    All-in-all £250. Not too bad.
  • Jokul Level 1 Level 1 (0 points)
    My iMac Late2006 have same problem recently. That really feak me out!
    I used Fan control, but it doesn't work. I may need to replace the 7300GT card sometime.
  • Ian Cheong Level 1 Level 1 (30 points)
    Brian Ibbott wrote:
    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.


    Exact same problem. When it got to instant black screen, though the machine was dead until it rebooted fine. Corruption was also visible on login desktop (horizontal line). Assumed it was a RAM error, but it wasn't. Followed usual procedure for debugging hardware vs software. Safe boot seemed to fix it. Tried several other fixes (cache cleaning, removing old kexts, etc) , since I didn't want to have to do an archive and install. No luck. Next presumed that it was a corrupted prefs file. Seems to be fixed on renaming /Library/Preferences/loginwindow.plist which then generates a clean copy on reboot. When looking for corrupt prefs files, I prefer to rename them as .dudyyyymmdd rather thna deleting, so if they turn out to be OK< I can restore previous settings.
  • Ian Cheong Level 1 Level 1 (30 points)
    UPDATE:
    Problem still not fixed. Improved but still there less severe - horizontal lines across some windows intermittently. Back to the drawing board....
  • Ian Cheong Level 1 Level 1 (30 points)
    Problem seems to have resolved - not sure exactly what fixed it. Certainly the problem was not ever there on safe boot. Some times it would appear on login desktop and sometimes not.

    The last thing I tried that seemed to fix it was an aborted attempt at archive and install (not enough disc space) that included changing the startup disc preference. So possibly it was a corrupt startup disk preference setting? I do think whatever was corrupt corrupted other preferences too, since rebuilding others partially fixed the problem along the way.

    Other things that may possibly have helped along the way in reverse order of what I tried:
    * run applejack in single user mode to clean out the system (<cmd>- to start single user; $ applejack)
    See http://applejack.sourceforge.net/
    * rebuild /Library/Preferences/SystemConfiguration (drag Library/Preferences/SystemConfiguration to desktop and restart)
    * rebuild /Library/Preferences/com.apple.loginwindow.plist
    * rebuild /Library/Preferences/com.apple.windowserver.plist
    * followed various instructions "Mac OS X: How to troubleshoot a software issue" at http://support.apple.com/kb/ht1199

    Good luck!
  • Ian Cheong Level 1 Level 1 (30 points)
    Sorry... everything after <cmd> got redlined by mistake and posts can't be edited. : (

    Should read:
    Other things that may possibly have helped along the way in reverse order of what I tried:
    * run applejack in single user mode to clean out the system (<cmd-s> to start single user; $ applejack)
    See http://applejack.sourceforge.net/
    * rebuild /Library/Preferences/SystemConfiguration (drag Library/Preferences/SystemConfiguration to desktop and restart)
    * rebuild /Library/Preferences/com.apple.loginwindow.plist
    * rebuild /Library/Preferences/com.apple.windowserver.plist
    * followed various instructions "Mac OS X: How to troubleshoot a software issue" at http://support.apple.com/kb/ht1199

    Good luck!
  • Olivercarding Level 1 Level 1 (0 points)
    DbGecko I am amazed that you have a good story about apple repairs in London, i have read countless tales of peoples computers going missing, or being damaged by this terrible company. I am a victim of the con that they pull having sent my white macbook to be repaired, they went back on their original price and gave me a much higer one that i couldn't afford. The macbook that they returned to me was black,had no harddrive, and only 1gb of ram.
    Personally, i would avoid applerepairsinlondon.co.uk like the plague.
  • Jokul Level 1 Level 1 (0 points)
    After failure to fix this problem using software, I bought a new video card. I took 20 minutes to replaced the card by myself. Finally this problem disappeared. This problem can not be fixed by controlling temperature of iMac.
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