11 Replies Latest reply: Dec 20, 2012 3:03 AM by cazoo
cazoo Level 1 Level 1 (0 points)

Hello,

I have an 27 inch iMac 2.66 GHz Intel  with 4GB Memory.  Over the past 6 months I've been experiences periodic freezes.  it is independent of what I am doing. The only way to recover is to power cycle the machine.  The last time I did this, the file that I was working on, buy hadn't saved, was corrupted, filled with a bunch of xml information.  This led me to believe it was my harddrive, so I completely tested the drive with the disk utility, found nothing but whiped it out and reinstalled the Mountain Lion from scratch.  The problem persisits.  I keep the Activity Monitor open and although a particular process doesn't jump out at me, I can say that the montior is not updating. ie. whole system is frozen. I checked to see if my machine qualified for the 1TB Seagate disk problem program, but it does not.  are there any other hardware diagnostics provided by apple that I can run to isolate the problem?  Has anyone else experienced this or do you have thoughts on what it could be.

 

Thank you


iMac, OS X Mountain Lion (10.8.2)
  • 1. Re: imac intermittently freezes
    mende1 Level 10 Level 10 (89,570 points)

    Insert the Applications DVD that came with the Mac and press D key on boot. If your computer didn't come with discs, press D key on boot and run extended test two times

  • 2. Re: imac intermittently freezes
    Linc Davis Level 10 Level 10 (117,815 points)

    If you have more than one user account, these instructions must be carried out as an administrator.

    Launch the Console application in any of the following ways:

    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

    ☞ In the Finder, select Go Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

    ☞ Open LaunchPad. Click Utilities, then Console in the icon grid.

    Step 1

    Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left.

    Enter "BOOT_TIME" (without the quotes) in the search box. Note the timestamps of those log messages, which refer to the times when the system was booted. Now clear the search box and scroll back in the log to the last boot time when you had the problem. Post the messages logged before the boot, while the system was unresponsive or was failing to shut down. Please include the BOOT_TIME message at the end of the log extract.

    Post the log text, please, not a screenshot. If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message. When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.

    Please do not indiscriminately dump thousands of lines from the log into a message.

    Important: Some private information, such as your name, may appear in the log. Edit it out by search-and-replace in a text editor before posting.

    Step 2

    Still in Console, look under System Diagnostic Reports for crash or panic logs, and post the entire contents of the most recent one, if any. In the interest of privacy, I suggest you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

  • 3. Re: imac intermittently freezes
    cazoo Level 1 Level 1 (0 points)

    Thank you Linc for this lengthy explanation.  I just returned from the apple store, where they determined that it was my harddrive even though I didn't see any errors and prelimanary tests at home and in the store were inconclusive. 

     

    Just for the record, when attempting to boot from the dvd containing the diagnostics, a small window flashed quickly reporting an error (too fast to read) and then shut down.  When I asked the technician at the mac store, he said that I cannot run Snow Leopard Diagnostics since I've already installed Mountain Lion. (I'm guessing there's a firmware incompatability issue otherwise I don't understand why).  I then asked how to get into the diagnostics and was told there is no way to do this as my chipset doesn't support it and I just have to bring the machine into the store. 

     

    It seems odd to me that I cannot run lowlevel diagnostics on the hardware. I am just wondering if there's a disk image I can download or a workaround for it.  In the meantime, I'll keep my fingers crossed that the disk swap fixed the freeze problem.

  • 4. Re: imac intermittently freezes
    Linc Davis Level 10 Level 10 (117,815 points)

    There's no other version of the AHT than the one you have, as far as I know. The installed version of OS X is irrelevant. I guess it's possible that a firmware update might disable the AHT, but I haven't heard of it.

     

    I wouldn't worry about it. The AHT is pretty much worthless anyway.

  • 5. Re: imac intermittently freezes
    cazoo Level 1 Level 1 (0 points)

    Okay, so my machine ran for about a day, and it just froze again.  Like before the disk swap, "top" was running in a terminal window and that was frozen.  Here are the log entrees as per your instructions above Step 1. There is nothing listed below the "System Diagnostic Reports" Section mentioned in Step 2.

     

    11/22/12 1:19:20.382 PM WindowServer[89]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fe4b510d490(2004), shield 0x7fe4b3c88120(2001), lock state 3

    11/22/12 1:19:20.382 PM WindowServer[89]: handle_will_sleep_auth_and_shield_windows: err 0x0

    11/22/12 1:19:20.000 PM kernel[0]: Previous Sleep Cause: 5

    11/22/12 1:19:20.000 PM kernel[0]: The USB device HubDevice (Port 1 of Hub at 0xfa000000) may have caused a wake by issuing a remote wakeup (2)

    11/22/12 1:19:20.000 PM kernel[0]: The USB device BRCM2046 Hub (Port 1 of Hub at 0xfa100000) may have caused a wake by issuing a remote wakeup (3)

    11/22/12 1:19:20.000 PM kernel[0]: The USB device Bluetooth USB Host Controller (Port 1 of Hub at 0xfa110000) may have caused a wake by issuing a remote wakeup (3)

    11/22/12 1:19:20.000 PM kernel[0]: 20062.862369: performCountryCodeOperation: Not connected, scan in progress[0]

    11/22/12 1:19:20.000 PM kernel[0]: HID tickle 315 ms

    11/22/12 1:19:21.157 PM hidd[46]: MultitouchHID: device bootloaded

    11/22/12 1:19:21.000 PM kernel[0]: AppleBCM5701::selectMedium - autoselect, any duplex, flow control allowed

    11/22/12 1:19:21.000 PM kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link down on en0

    11/22/12 1:19:24.000 PM kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en0, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [796d,2301,0de1,0300,cde1,3c00]

    11/22/12 1:19:26.952 PM configd[18]: network changed: v4(en0-:10.10.10.102) DNS- Proxy- SMB

    11/22/12 1:19:27.052 PM PhotoStreamAgent[214]: <MSASStateMachine: 0x7fcf10414030>: Encountered error: NSURLError:

    Domain  : NSURLErrorDomain

    Code    : -1000

    Desc    : bad URL

    UserInfo: {

        NSLocalizedDescription = "bad URL";

        NSUnderlyingError = "Error Domain=kCFErrorDomainCFNetwork Code=-1000 \"bad URL\" UserInfo=0x7fcf10495b60 {NSLocalizedDescription=bad URL}";

    }

    ...Underlying error:

    __NSCFError:

    Domain  : kCFErrorDomainCFNetwork

    Code    : -1000

    Desc    : bad URL

    UserInfo: {

        NSLocalizedDescription = "bad URL";

    }

    . This command has encountered 4 errors so far.

    11/22/12 1:19:28.234 PM configd[18]: network changed: v4(en0+:10.10.10.102) DNS+ Proxy+ SMB

    11/22/12 1:19:40.000 PM kernel[0]: en1: 802.11d country code set to 'US '.

    11/22/12 1:19:40.000 PM kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165

  • 6. Re: imac intermittently freezes
    cazoo Level 1 Level 1 (0 points)

    Note: i do have my mac plugged into an apc battery backup.  I'll remove this from the chain to eliminate it being a part of the problem. All of my perripherals have not yet been added except for an iomega drive which I have now unplugged as well. 

  • 7. Re: imac intermittently freezes
    Linc Davis Level 10 Level 10 (117,815 points)

    Disable Photo Stream in the iCloud preference pane. See whether there's any improvement.

  • 8. Re: imac intermittently freezes
    cazoo Level 1 Level 1 (0 points)

    I tried this, to no avail.

  • 9. Re: imac intermittently freezes
    Linc Davis Level 10 Level 10 (117,815 points)

    You wrote earlier that you were told at an Apple Store that the hard drive was at fault. Was the drive replaced? If it was, did you go back?

  • 10. Re: imac intermittently freezes
    cazoo Level 1 Level 1 (0 points)

    Yes, the drive was replaced.  I have been on the phone with tech support for the past hour or so trying to narrow it down.  As my system is still pretty clean from the fresh install, there aren't too many culprits to look at.  We've just made a few possible changes, so I'm now waiting for another freeze. 

  • 11. Re: imac intermittently freezes
    cazoo Level 1 Level 1 (0 points)

    So my imac was at the apple store for about 3 weeks.  Because the problem was intermittent, they had a hard time recreating it.  Ultimately the following was replaced:

    -Hardrive

    -Video card

    -Logic Board

    -2x Dimm

    -The Display (which was ruined during all the diagnostic testing I'm told)

     

    I brought the imac home and it purred wonderfuly for about a week. Yesterday it froze again with a slightly different twist.  The mouse could still move the cursor and the screen was pixelated.  When I rebooted it occurred several times again.  Now it boots and the screen is gray with white stripes sometimes with yellow boxes sometimes without, but basically unusable.  At least it's no longer an intermitent problem.

     

    I will bring it back yet again today but does has anybody seen anything like this?