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  1. #1

    jmccoy's Avatar
    Member Since
    Feb 15, 2010
    Limerick City, Rep. of Ireland
    20" iMac (Mid-2007), 4GB RAM, 250GB HDD, 2Ghz Core 2 Duo, Snow Leopard.
    Help: Mid 2007 model iMac keep's crashing.
    Hello folks,

    I'm new to this forum, so hello everybody. The reason I have joined is I am having some serious problems with my mid-2007 iMac which keeps crashing. The exact model in question is a 20" with 2Ghz Core 2 Duo, 1GB RAM (currently installed) and running Snow Leopard 10.6.2.

    The problem started around 2 weeks ago when the machine kernel paniced and went into a cycle of reboot and crash, thankfully the machine stayed up long enough for me on one occassion enabling me to rescue my data. I browsed the net on my netbook to see if I could diagnose the problem, I followed all the advice on resetting PRAM and verifying and repairing disc permissions, also I have taken out the 2 x 2GB RAM modules that I upgraded the machine with last September and replaced them with the original 1GB module that came with the machine, the machine also went through the Apple Hardware Test which it passed and a full reformat of the drive and reinstallation of the OS but to no avail, the problem persisted.

    I brought the machine into the local Apple Premium Reseller here in Limerick, Ireland and explained all that I had done, they kept the machine for a week and did everything I as well as stripping down the machine to ensure everything was connected and seated correctly, they called me and said the machine was working for more than 24 hours without a panic. They only charged me 35 for their time and said that if the problem reoccured to call back as it would more than likely be the logic board that is at fault.

    Anyway, before I do call back to them, I would be grateful if someone here who has the knowledge could look at the latest panic report and advise me if they can identify the problem from it. Many thanks in advance !

    Mon Feb 15 12:32:49 2010
    Machine-check capabilities (cpu 1) 0x0000000000000806:
    family: 6 model: 15 stepping: 10 microcode: 146
    Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz
    6 error-reporting banks
    threshold-based error status present
    Machine-check status 0x0000000000000004:
    machine-check in progress
    MCA error-reporting registers:
    IA32_MC0_STATUS(0x401): 0xf200004000000800 valid
    MCA error code: 0x0800
    Model specific error code: 0x0000
    Other information: 0x00000040
    Threshold-based status: No tracking
    Status bits:
    Processor context corrupt
    Error enabled
    Uncorrected error
    Error overflow
    IA32_MC1_STATUS(0x405): 0x0000000000000000 invalid
    IA32_MC2_STATUS(0x409): 0x0000000000000000 invalid
    IA32_MC3_STATUS(0x40d): 0x0020000000000000 invalid
    IA32_MC4_STATUS(0x411): 0x0000000000000011 invalid
    IA32_MC5_STATUS(0x415): 0xf2001410300c0400 valid
    MCA error code: 0x0400
    Model specific error code: 0x300c
    Other information: 0x00001410
    Threshold-based status: No tracking
    Status bits:
    Processor context corrupt
    Error enabled
    Uncorrected error
    Error overflow
    panic(cpu 1 caller 0x2a6c94): Machine Check at 0x0028d301, thread:0x497c7a8, trapno:0x12, err:0x0,registers:
    CR0: 0x8001003b, CR2: 0x137c8000, CR3: 0x00100000, CR4: 0x00000660
    EAX: 0x00000000, EBX: 0x00000002, ECX: 0x00000000, EDX: 0x00000000
    ESP: 0x21b72ce0, EBP: 0x21b72d48, ESI: 0x00000001, EDI: 0x00000000
    EFL: 0x00010246, EIP: 0x0028d301

    Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
    0x1b625fb8 : 0x21b2bd (0x5cf868 0x1b625fec 0x223719 0x0)
    0x1b626008 : 0x2a6c94 (0x5918f8 0x5919e5 0x28d301 0x497c7a8)
    0x1b6260f8 : 0x29e8d2 (0x1 0x0 0x0 0x0)
    0x21b72d48 : 0x28f0ce (0x84b6e0 0x21a87000 0x0 0x21a87000)
    0x21b72df8 : 0x28f373 (0x2abb3 0x0 0x2 0x21a87000)
    0x21b72e18 : 0x258e08 (0x2abb3 0x21a87000 0x0 0x0)
    0x21b72ee8 : 0x260449 (0x1750ebc 0x21b72fcc 0x1 0x84b6e0)
    0x21b73018 : 0x260c82 (0x21a8f000 0x0 0x1 0x0)
    0x21b73058 : 0x259a5d (0x1750ebc 0x21a87000 0x0 0x21a8f000)
    0x21b73098 : 0x2c8266 (0x1750ebc 0x21a87000 0x8000 0x2c7c92)
    0x21b730e8 : 0x448d77 (0x1d2dc540 0x32eae10 0x0 0x1)
    0x21b73178 : 0x448f98 (0x332e004 0x21a8d000 0x1e 0x21b73bfc)
    0x21b731c8 : 0x42a4b9 (0x21b73ba0 0x0 0x21b73bfc 0x21b73bf8)
    0x21b73c18 : 0x2f684d (0x21b73c34 0x18ba76c 0x21b73c48 0x0)
    0x21b73c88 : 0x2e1e23 (0x32eac54 0x3e5f404 0x3e5f418 0x21b73ec0)
    0x21b73f78 : 0x4ee947 (0x48eb540 0x3f8d688 0x48af514 0x1)
    0x21b73fc8 : 0x29e3fd (0x3f8d684 0x0 0x10 0x2b4f5a4)

    BSD process name corresponding to current thread: mdworker

    Mac OS version:

    Kernel version:
    Darwin Kernel Version 10.2.0: Tue Nov 3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386
    System model name: iMac7,1 (Mac-F4238CC8)

    System uptime in nanoseconds: 74381810627
    unloaded kexts:
    loaded kexts:
    com.pctools.iantivirus.kfs 1.0.1 1.0.1d8 2.6.0 1.9.2d0 1.0 14 3.1.0 17 7.0.0 6.0.6 11 1.1.2 1.7.9a4 2.8.16 6.0.6 3.1.14b1 421.91.26 19 4.0.1d0 1.4.9 170.0.14 2.1.0 251.1.4 2.2.4f3 2.6.0 31 eZlib 1.0.0d1 1.3.0 1.6.0 3.8.4 2.0.1 2.5.0 3.7.5 4.4.0 3.7.5 1.3 1.4 1.3 1.4 1.3 1.4 t 96.0.0 0 0 2.1.11 96.0.0 17 - last loaded 40771307923 10 14 10 1.7.9a4 10 20 73.0 2.2.4f3 10.0.3 1.7.9a4 1.7.9a4 1.7.2fc1 1.3 2.0.3 310.6 1.9 41 1.7.9a4 1.7.9a4 3.0.1d2 4.0.1d0 2.0 6.0.6 6.0.6 2.0 2.2.4f3 2.2.4f3 2.2.4f3 1.4.0d7 1.4.0d7 1.2.0a3 1.2.0a3 3.8.4 3.8.5 3.7.5 2.6.0 1.6 1.6 1.6 402.1 2.0 2.5.0 2.6.0 3.8.5 2.0.2 2.5.0 4.1.7 3.8.5 1.3.0 1.6.1 1.1 6 1.0.0d1 281 1.6 1.3 2.6 1.3.0

  2. #2
    "mdworker" is spotlight indexing the drive. Not the cause of your problems.

    "processor context corrupt" indicates to me that its the logic board, but I can't be certain of that from here.

  3. #3

    jmccoy's Avatar
    Member Since
    Feb 15, 2010
    Limerick City, Rep. of Ireland
    20" iMac (Mid-2007), 4GB RAM, 250GB HDD, 2Ghz Core 2 Duo, Snow Leopard.
    Thanks for your reply mate.

    The whole "processor context corrupt" thing hit me as well when I tried to decipher the log, if it is the logic board, it's going to be one heck of an expensive repair, near enough to €450 in fact.

    The machine has been working again for the past few hours, however, owing to the intermittent nature of this problem my worries are far from over.

  4. #4

    jmccoy's Avatar
    Member Since
    Feb 15, 2010
    Limerick City, Rep. of Ireland
    20" iMac (Mid-2007), 4GB RAM, 250GB HDD, 2Ghz Core 2 Duo, Snow Leopard.
    I didn't bother shutting the machine down last night, but left the power on in sleep mode for the night, no panics or shutdowns yet, hopefully this might do the trick until money can be found to get this fixed or even upgrade to the new model.

  5. #5

    Member Since
    Aug 04, 2010
    Before you give them your money...
    Hi I've had similair problems. I have an intel iMac from the same period running Snow Leopard.
    There 2 types of 'crashes' i experience. Either a total 'freeze' of the OS (If a youtube movie was playing i noticed it keeps playing)
    The other crash is where it seems like my screen just turns black , The OS keeps responding, for example 'shift-alt-Q' did log me out.

    I also noticed that the machine seems to be making more noise than before, as if it is working really hard.

    Most likely, theres dust clogging up the air supply to the vents (its a small hole just below your power plug). If that hole is clogged your machine will get too hot and your screen will auto shut off.

    So i'd say unplug the iMac , and vacuum any hole you find.
    Correction & Update:
    not below but ABOVE your power plug is the airfilter , very well hidden behind the iMac's stand...
    Mine was very dusty, i cleaned it and my iMac stopped sounding like it it was sufficating! I'd say thats a good sign....

    Also theres a neat widget that keeps track of your fans and temperatures you might wanna check out: iStat Pro, a Dashboard Widget by iSlayer

    update: found another fan app that manages the fans as well:

    I'm gonna do the same and lets hope we save ourselves 400 bucks

    good luck


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