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  1. #1

    Member Since
    Jan 30, 2011
    Kernel panics and screen glitches on iMac
    Lately, I've been having a lot of difficulty with my work iMac.

    Within minutes of booting up, I receive kernel panics, more frequently accompanied by screen glitches such as horizontal lines or holes in windows.

    Often I don't even make it past start-up, and I receive a kernel panic before I can login.

    I'm currently working in safe mode and everything seems to be running smoothly. No glitches, no kernel panics. No sign that the computer will immediately shut down. In fact, I'm thinking of simply working in safe mode from now on.

    Any assistance would be greatly appreciated. I've reinstalled the previous RAM we used (we've recently installed new RAM, and we thought that this may have been the problem), and I've run Apple Hardware Test. Both have not improved matters, and the test came back free of issues.

    Please let me know if I need to include anymore information that may assist.

    Below is a log of the latest panic:

    panic(cpu 1 caller 0x001A49CB): Unresolved kernel trap (CPU 1, Type 14=page fault), registers:
    CR0: 0x8001003b, CR2: 0x4f0fe38e, CR3: 0x0123f000, CR4: 0x000006e0
    EAX: 0xbeef7201, EBX: 0x0013999b, ECX: 0x00000585, EDX: 0x4f0fe000
    CR2: 0x4f0fe38e, EBP: 0x25a4bb58, ESI: 0x04620000, EDI: 0xbeef7201
    EFL: 0x00010206, EIP: 0x0090057a, CS: 0x00000008, DS: 0x00000010

    Backtrace, Format - Frame : Return Address (4 potential args on stack)
    0x25a4b908 : 0x128d0d (0x3cc65c 0x25a4b92c 0x131f95 0x0)
    0x25a4b948 : 0x1a49cb (0x3d2a94 0x1 0xe 0x3d22b8)
    0x25a4ba58 : 0x19b3a4 (0x25a4ba70 0x0 0x3 0x7029)
    0x25a4bb58 : 0x90068e (0x4620000 0xbeef7201 0x0 0x0)
    0x25a4bb78 : 0x9006ec (0x4620000 0xbeef7201 0x1 0x4620000)
    0x25a4bbb8 : 0x8fa016 (0x4620000 0x479d000 0x2faa9080 0xa17080)
    0x25a4bc48 : 0x8e4857 (0x479d000 0x4888a00 0x1074a000 0x0)
    0x25a4bcf8 : 0x3b19b9 (0x479d000 0x1 0x25a4bd2c 0x25a4bd28)
    0x25a4bd38 : 0x3b4e75 (0x479d000 0x1 0x3ff1010 0x1)
    0x25a4bd68 : 0x189fdc (0x479d000 0x1 0x3ff1010 0x4c23dc0)
    0x25a4bdb8 : 0x12b4ee (0x4c23d8c 0x40d2da0 0x25a4bdf8 0x11e042)
    0x25a4bdf8 : 0x124b17 (0x4c23d00 0x3fbd5a8 0x470752c 0x0)
    0x25a4bf08 : 0x195f2e (0x25a4bf44 0x0 0x0 0x0)
    0x25a4bfc8 : 0x19b81e (0x46d85a0 0x1 0x10 0x46d85a0) No mapping exists for frame pointer
    Backtrace terminated-invalid frame pointer 0xbfffed58
    Kernel loadable modules in backtrace (with dependencies):

    Kernel version:
    Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    Are you sure you posted the entire log entry? Looks like part of it is missing as I don't see the point of entry into panic.

  3. #3

    EvenStranger's Avatar
    Member Since
    Dec 09, 2010
    Currently 13" Late 2010 MBA, 4GB/128GB; Early 2011 13" MBP, dual core i7 2.7ghz, 4gb ram, 500gb hd
    Backtrace terminated-invalid frame pointer 0xbfffed58
    Kernel loadable modules in backtrace (with dependencies):

    From your description and the lines above, it definitely sounds as though the video card is bad. Depending on the model of iMac, it could be just a video card or it could be a full logic board replacement. Either way, I'd take it to an Apple repair center and have it fixed. If it's still under warranty, then you're golden. Depending on the age of the iMac, if it's a full logic board replacement, you might find that it's more cost effective in the long run to replace the unit with a newer one.

  4. #4

    Member Since
    Jan 20, 2011
    Amherst, Ohio
    Late 2015 27" iMac Retina - 3.2 i5 - 8GB - 256GB SSD - R9 M380 GPU
    Is this a G5 iMac? If so, you are probably experiencing bad capacitors. It was quite the common problem with the G5 iMacs.

    I have a link somewhere on here with a site that sells capacitor kits for the iMacs. Just search my username to find it.

    EDIT - Here's the link
    Late 2015 27" iMac Retina - 3.2GHz i5 - 8GB - 256GB SSD - R9 M380 GPU
    Former - Late 2012 Mini

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