Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Kernel error upon startup

My iMac is unable to startup because of a kernel error. I have tried to troubleshoot it on my own, but I am out of ideas. I am able to select boot from a cd. However, I receive a kernel error shortly after this option is selected.

I was able to run an apple diagnostic. The test came back with the error: 4sns/1/40000000: Twop -128.00.

I should note that the computer is not covered by warranty and it came to me without hard drive. I installed a new hard drive.

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That error code indicates a problem with the main logic board. Try resetting the SMC, if that doesn't cure the problem, you'll probably have to replace the logic board.

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I was able to connect the imac to another imac via target mode. I installed an operating system on the hard drive. However, once I restarted the iMac it still came up with a kernel error. Based on that information, do you still think it is a logic board issue? I have a hunch it is something else because I was able to run target mode and diagnostic test


Target mode does not use your CPU only the power and circuits to the HD. Diagnostic test do not use all the extensions (neither does safe mode) a full boot would. A corrupt extension (in WinDUHows they're called drivers) might be the problem, except AHT is saying you have a logic board error.


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Here is a copy of the error message I received when I booted this iMac in target mode of another iMac:

Interval Since Last Panic Report: 14 sec

Panics Since Last Report: 1

Anonymous UUID: 70E0AA1E-2E96-4985-B765-C02213996D25

Tue Sep 25 08:16:30 2012

panic(cpu 1 caller 0x2a6ac2): Kernel trap at 0x00000000, type 14=page fault, registers:

CR0: 0x8001003b, CR2: 0x00000000, CR3: 0x25561000, CR4: 0x00000660

EAX: 0x064cc004, EBX: 0x064cc004, ECX: 0x00000080, EDX: 0x0525b004

CR2: 0x00000000, EBP: 0x2fdb32d8, ESI: 0x0525b004, EDI: 0x076a4a04

EFL: 0x00010206, EIP: 0x00000000, CS: 0x00000008, DS: 0x064c0010

Error code: 0x00000010

Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)

0x2fdb30d8 : 0x21acfa (0x5ce650 0x2fdb310c 0x223156 0x0)

0x2fdb3128 : 0x2a6ac2 (0x590a50 0x0 0xe 0x590c1a)

0x2fdb3208 : 0x29c968 (0x2fdb3220 0x3425 0x2fdb32d8 0x0)

0x2fdb3218 : 0x0 (0xe 0x76a0048 0x2fdb0010 0x37030010)

0x2fdb32d8 : 0x3703e98a (0x525b004 0x64cc004 0x2fdb3344 0x0)

0x2fdb3368 : 0x3703cab1 (0x525b004 0x64cc004 0x2fdb33a8 0x36f66a6f)

0x2fdb33a8 : 0x3703b696 (0x525b004 0x64cc004 0x1 0x0)

0x2fdb3438 : 0x370

Model: iMac8,1, BootROM IM81.00C1.B00, 2 processors, Intel Core 2 Duo, 2.4 GHz, 1 GB, SMC 1.29f1

Graphics: ATI Radeon HD 2400 XT, ATI Radeon HD 2400, PCIe, 128 MB

Memory Module: global_name

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), Broadcom BCM43xx 1.0 (

Bluetooth: Version 2.2.0f18, 2 service, 1 devices, 1 incoming serial ports

Network Service: AirPort, AirPort, en1

Serial ATA Device: Hitachi HDP725025GLA380, 232.89 GB

Parallel ATA Device: MATSHITADVD-R UJ-875

USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8502, 0xfd400000

USB Device: Keyboard Hub, 0x05ac (Apple Inc.), 0x1005, 0xfd100000

USB Device: Apple Optical USB Mouse, 0x05ac (Apple Inc.), 0x0304, 0xfd130000

USB Device: Apple Keyboard, 0x05ac (Apple Inc.), 0x021d, 0xfd120000

USB Device: USB Optical Mouse, 0x093a (Pixart Imaging, Inc.), 0x2510, 0x1a200000

USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x1a100000

USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x820f, 0x1a110000

USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x5d100000

FireWire Device: Target Disk Mode, AAPL, Up to 400 Mb/sec

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