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OSX Lion + 2011 iMac 27'' + Video = Freeze

350566 Views 1,999 Replies Latest reply: Apr 15, 2014 3:02 PM by cimbalino RSS Branched to a new discussion.
  • Peter Stroud Calculating status...
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    Nov 27, 2011 9:57 AM (in response to Studio K)

    Adding my voice to this thread as I too am having all problems listed since installing Lion last night... Freezing, crashing, fan constantly running. Even native apps like TextEdit and iPhoto (iLife 11) are causing freezes. I have a MacBook-early 2008 2.4GHz  Intel Core 2 Duo. 4G Ram Have tried all the usual Disk Utility repairs, suggestions on thread and new ones offered with Base OS X Startup partition. Now getting ready to try clean install. If doesn't work I'll have to revert back to Snow Leopard for time being.

     

    Really disturbing. I'm a longtime Mac user and for once took a step out and just installed Lion without suspect. I didn't expect my entire weekend to be tied up trying to make my computer work after an OS X upgrade.

  • milloy8 Calculating status...
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    Nov 27, 2011 10:44 AM (in response to Peter Stroud)

    Picked up a 27" iMac on Friday, been a Mac user for all of three days now, I'm having the same issue that everyone in this thread is experiencing. I just went to the Apple store to get some advice, they claim it's the first they've heard of it. When I explained that there is a 90+ page thread on this forum on the issue they said that I "could find just about anything on the internet", a bit frustrating to say the least. I set up an appointment at the Genius Bar this afternoon, but it doesn't sound like it will solve anything given other's experiences, so I doubt I'll bother hauling my 30lb computer there . The specialist said they'll probably end up swapping my computer for a new one, which inevitably will encounter the same exact issue because it runs Lion.  I'll be checking this thread frequently over the next week, if Apple doesn't address this it's going back, and I'm going back to a PC. My $300 Compaq laptop has no problem running video clips.

  • Studio K Level 2 Level 2 (305 points)
    Currently Being Moderated
    Nov 27, 2011 11:05 AM (in response to milloy8)

    Milloy,

     

    It is unlikely that there will be a solution within the next week.  LION was introduced in July, and, 5 months on, it is STILL not fixed.

     

    Apple has unleashed an OS that can potentilly ruin your expensive hardware (by forcing you to power it off while the HD is running).  They have not acknowledged that there is trouble (never mind telling us there's a solution coming) and continue to sell iMacs with this diabollically poisonous OS pre-installed.

     

    If you hang on to the iMac, be prepared to wait for a while before using it safely (assuming they ever resolve this).

     

    But do make sure to run the software updates (you should be at 10.7.2).  Some on this thread have apparently benefited from them and are no longer freezing.

     

    But not all of us, unfortunately.

  • milloy8 Level 1 Level 1 (0 points)
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    Nov 27, 2011 3:11 PM (in response to Studio K)

    Thanks for the response Studio K

     

    I ended up lugging my iMac to the Genius Bar, he was adamant that it was a hardware issue, not a Lion issue. I urged him to read this thread, but he said that he works on 27" iMacs all the time and he has never seen this problem. I came home, followed his advice - ran the software update, downloaded flash player. First youtube clip, crash, absolutely maddening.

  • milloy8 Level 1 Level 1 (0 points)
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    Nov 27, 2011 3:42 PM (in response to milloy8)

    Sorry, forgot to mention that they gave me a completely new computer

  • Marjean54 Calculating status...
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    Nov 27, 2011 3:55 PM (in response to rubenlx)


    I may have solved my problem since upgrading to Lion.  This morning I opened Preferences>Mouse.  I unchecked everything under Point & Click and More Gestures.

     

    The trouble I had with Lion was the slight shifting of open documents and windows, immediately followed by freezing of all applications and windows.  My curser still worked and I was able to open the "force quite" window.

     

    I haven't had a problem since unchecking as stated above. 

  • Marjean54 Level 1 Level 1 (0 points)
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    Nov 27, 2011 3:56 PM (in response to Marjean54)

    I'd like to know if this solves anyone else's problem.

  • milloy8 Level 1 Level 1 (0 points)
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    Nov 27, 2011 5:18 PM (in response to Marjean54)

    I tried it Marjean, no luck

  • SpongeBad Calculating status...
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    Nov 28, 2011 1:06 AM (in response to milloy8)

    Since starting to run Rember on Friday, I have not experienced a crash (I told it to loop 100 times).  Machine is slow to come off the screen saver (all sleep is disabled, so it's constantly displaying something on screen), but other than that, behaves like a normal, stable machine. 

     

    I think this pretty much rules out a hardware issue, since if it was hardware, I would have expected it to rear its head at some point in the past three days.  Still leaving Rember running for now, just to keep the machine alive while it does some tasks for me (Time Machine back ups, a few software updates).

     

    If anyone else gets a chance to try running this application in the background (it's free), I'd love to hear if it stabilizes your machine while running, as well.

     

    All signs point to some kind of issue with the power management software.  Hopefully Apple figures it out and gets it fixed soon (maybe it needs a firmware update, rather than just an OS update).

  • DawnM415 Calculating status...
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    Nov 28, 2011 6:21 AM (in response to SpongeBad)

    Well, I don't know if this is going to be a permanent fix or not but I have an internet based phone (ooma) and I unplugged it for another reason and in the process found that my iMac was not glitching as badly.

     

    So, I have run a 45 minute streaming video from CBS.com to test it and it ran all the way through without freezing.

     

    I am now leaving the home phone unplugged completely.  I rarely use it anyway and I can still get messages while it is unplugged.

     

    I have no idea if any updates will fix this issue or not, but if it works this way, I am fine with that.

  • stephen_of_adelaide Calculating status...
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    Nov 28, 2011 3:42 PM (in response to rubenlx)

    I'll add my voice to this thread.

     

    Machine: 21.5" iMac 2011, lion (10.7.2).

     

    Problem: Kernel panic on wake from sleep. It doesn't  happen every wake from sleep but it would happen about 1-2 times a day when waking from sleep. It will happen about 5 seconds after waking from sleep.

     

    Troubleshooting to date: I've deleted a few kernel extensions from third parties. Stopped non-standard software from running to no avail. Run memory tests and no problems detected. 

     

    Next steps: I'm now turning off filevault (time machine is taking its time). I'm then going to downgrade to snow leopard. This downgrade will rule out a few things: 1) if the problem is caused by lion, 2) caused by third party software that is installed or has been installed, or 3) incorrect file permissions.

     

    If the problem persists after downgrade, it's fair to assume that the problem is hardware related (eg. logic board).

     

    I can't be bothered messing around hence I'm going the whole hog and downgrading. I want this problem sorted. However, my gut says it is one of two things: Lion or logic board (there are other options like third party extensions). I'm leaning towards lion because of the buggy nature of lion to date. I've had flaky wifi and sound on two machines with lion. Downgrade fixed my other machine so second time is a charm.  

  • SpongeBad Level 1 Level 1 (0 points)

    I was able to keep my system running from Friday to today (Tuesday) with Rember running in the background.  I had it set to loop testing all my memory (12GB).  It was, however, slowing my system down because it was hogging so much RAM.

     

    I turned it off today, and had a kernel panic within about 30 minutes of doing so.  The crash log shows the same issue with power management as I've mentioned before.

     

    I am now running Rember in the background, but have limited it to testing 1GB of RAM.  We'll see if that helps keep the system alive (if my theory that Rember constantly moving data in and out of memory utilizing the CPU, thus preventing it from kicking in whatever "power saving" feature is causing the crash is correct, it should).

     

    I tried limiting Rember to 1MB of memory, but it runs through the tests far too quickly (has a max of 255 loops).

     

    I have found (like others have mentioned) that my iMac is running significantly hotter than normal under Lion.  I didn't really like that, so am now running SMCFanControl, as well, with the CPU fan set to maximum speed.  This has helped bring down the CPU temperature by about 5 degrees Celcius, and the back of the system is noticeably cooler to the touch.  Fan noise is, of course, a little more, but I can live with that.

  • jrey1234 Calculating status...
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    Nov 29, 2011 3:16 PM (in response to Marjean54)

    I have noticed this "slight shifting" like it bounces left to right just before a GDI Debug dump. Always in Safari.  I have not tried your suggestion,  as I am going to the 5.1.2 Safari update first and see if that helps.

     

    The screens do not normally show this slight shifting, then gets worse just before it quits.

  • Marjean54 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Nov 29, 2011 3:30 PM (in response to jrey1234)

    jrey, I had the same problem as you...the shifting of Safari and other applications just before they would hange (freeze).  I was able to use the curser to open the "force quit" window only.  Since unchecking all Mouse preferences under Point & Click and More Gestures, I haven't had the problem...it's been several days now.

  • SpongeBad Level 1 Level 1 (0 points)
    Currently Being Moderated
    Nov 29, 2011 5:01 PM (in response to SpongeBad)

    Have done another test, let the display go to sleep while running Rember, and was able to bring it back to life a few hours later with no issue (haven't been able to do that since updating to Lion).

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