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Help! iMac reboots no matter what i do

398 Views 12 Replies Latest reply: Jan 1, 2013 10:08 PM by jigzman RSS
jigzman Calculating status...
Currently Being Moderated
Dec 29, 2012 12:31 AM

I've been doing some song arranging in this iMac I bought just a few months ago, using the software Presonus Studio One v2. It first started rebooting occasionally when I try to export my arrangement into an mp3 file. But then after that it started happening just while I was doing song playback.


I managed to finish my work there and jumped into video editing using a trial version of Adobe CS6. But it just got worse and worse, rebooting every 15 min on average. At first I thought that the problem has something to do with my audio interface connected by firewire because in one of the panic reports, a part of the stack said an exception is thrown by the apple.IOFirewireDriver or somethin'. So I turned it off and disconnected it because I don't need it for video editing, but it still happens a lot of times. There was even a point where I was just watching a youtube video and it flipped on me.


Please help. I bought this expensive setup for me to be able to do all these things, even the thought of taking it back to be replaced scares me.




iMac 27" 3.4GHz Quad-Core Intel Core i7 || 20 GB DDR3 || AMD Radeon HD 6970M 2GB GDDR5 || 1TB Serial ATA Drive || MacOSX 10.8.2 || Presonus Studio One v2


Kernel Panic report below was the latest:


Interval Since Last Panic Report:  135628 sec

Panics Since Last Report:          13

Anonymous UUID:                    165F239F-9482-78BB-3703-E68BB1475833


Sat Dec 29 00:04:20 2012

panic(cpu 0 caller 0xffffff8006cb7bd5): Kernel trap at 0xffffff8006c43ca1, type 14=page fault, registers:

CR0: 0x000000008001003b, CR2: 0xfffffe8043db3888, CR3: 0x00000000095be000, CR4: 0x00000000000606e0

RAX: 0x0000000000000000, RBX: 0x0000000000000000, RCX: 0x0000000009000000, RDX: 0xffffff802fdbc7c0

RSP: 0xffffff8249babd20, RBP: 0xffffff8249babd50, RSI: 0xffffff8249babdf8, RDI: 0xffffff802fdbc7b0

R8:  0xffffff8249babd50, R9:  0x0000000132d2feff, R10: 0xffffff80072bdc20, R11: 0x00000000fffff880

R12: 0xfffffe8043db3880, R13: 0xffffff802fdbc7b0, R14: 0xffffff8249babdf8, R15: 0xffffff803296d000

RFL: 0x0000000000010282, RIP: 0xffffff8006c43ca1, CS:  0x0000000000000008, SS:  0x0000000000000000

Fault CR2: 0xfffffe8043db3888, Error code: 0x0000000000000000, Fault CPU: 0x0


Backtrace (CPU 0), Frame : Return Address

0xffffff8249bab9c0 : 0xffffff8006c1d626

0xffffff8249baba30 : 0xffffff8006cb7bd5

0xffffff8249babc00 : 0xffffff8006cce4ed

0xffffff8249babc20 : 0xffffff8006c43ca1

0xffffff8249babd50 : 0xffffff8006c435d2

0xffffff8249babe30 : 0xffffff8006c245ed

0xffffff8249babe60 : 0xffffff8006fb9117

0xffffff8249babed0 : 0xffffff8006fba451

0xffffff8249babf60 : 0xffffff8006c3dcde

0xffffff8249babfb0 : 0xffffff8006cb26b7


BSD process name corresponding to current thread: kernel_task


Mac OS version:



Kernel version:

Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64

Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333

Kernel slide:     0x0000000006a00000

Kernel text base: 0xffffff8006c00000

System model name: iMac12,2 (Mac-942B59F58194171B)


System uptime in nanoseconds: 808648622996

last loaded kext at 343217252722:          1.8 (addr 0xffffff7f88f02000, size 229376)

last unloaded kext at 129572283442:          5.2.5 (addr 0xffffff7f875cf000, size 65536)

loaded kexts:

tc.tctechnologies.driver.Saffire          3.5.6 11675          1.8          75.15          1.9.5d0          4.0.9f33          3.0          1.60          100.12.69          122          2.3.1f2          3.5.10          8.0.0          1.0.0d1          2.3.1f2          8.0.0          1.0.0          170.2.3          7.0.0          4.0.9f33          1.0.0          1.6.0          1.0.33          3.2.11          2.0.2d0          8.0.0          1.0.0          320.15          3.5.1          3.1.0          1.0.0d1          1.0.0d1          34          404          2.2.2          5.2.5          4.9.6          3.2.5b3          600.70.23          2.4.1          5.4.0          1.6.1          1.6          1.5          1.7          1.9          1.6          1.6          196.0.0          4.0.39          2          196.0.0          165.5          165.5          4.0.9f33          235.28          10.0.6          1.0          2.3.1f2          86.0.3          4.0.9f33          19.0.26          1.0.4          4.0.9f33          2.2.5          1.0.10d0          1.0.10d0          3.2.11          2.3.5          1.1.8          1.1.8          1.8.9fc10          1.6          8.0.0          8.0.0          2.3.1f2          2.3.5          2.3.1f2          3.1.4d2          1.0.0          5.2.0d16          1.8.5          1.8.5          1.8.5          1.2.5          3.5.1          1.7          1.7.1          1.7.1          5.2.5          2.5.0          3.5.1          3.5.0          3.5.1          5.2.5          5.2.5          5.2.5          1.6.0          2.1.1          4.5.5          1.0.2b1          500.15          3.0          2.2.1          5.4.0          1.6.1          1.8.0          1.1          220          1.0.0d1          7          344          1.8          28.21          1.6          2.7.2          1.4          1.0

Model: iMac12,2, BootROM IM121.0047.B1F, 4 processors, Intel Core i7, 3.4 GHz, 20 GB, SMC 1.72f2

Graphics: AMD Radeon HD 6970M, AMD Radeon HD 6970M, PCIe, 2048 MB

Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620

Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620

Memory Module: BANK 0/DIMM1, 8 GB, DDR3, 1333 MHz, 0x802C, 0x31364B544631473634485A2D314734443120

Memory Module: BANK 1/DIMM1, 8 GB, DDR3, 1333 MHz, 0x802C, 0x31364B544631473634485A2D314734443120

AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380:

Bluetooth: Version 4.0.9f33 10885, 2 service, 18 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

Serial ATA Device: WDC WD1001FALS-403AA0, 1 TB

Serial ATA Device: OPTIARC DVD RW AD-5690H

USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x850b, 0xfa200000 / 3

USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2

USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 4

USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 5

USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2

USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfd110000 / 4

USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3

iMac (27-inch Mid 2011), OS X Mountain Lion (10.8.2)
  • Shootist007 Level 6 Level 6 (16,640 points)
    Currently Being Moderated
    Dec 29, 2012 3:47 AM (in response to jigzman)

    You have a hardware problem of one type or another and the only people that can fix it is Apple. So take it to an Apple store and have it checked out.

  • WZZZ Level 6 Level 6 (11,900 points)
    Currently Being Moderated
    Dec 29, 2012 5:30 AM (in response to jigzman)

    Not all KPs are from hardware problems (often RAM.) Whatever this is, it may be the culprit and you should either uninstall it or disable it temporarily using the instructions below. But, before you try that, boot into Safe Boot, Shift at the startup chime (will need much longer to boot) and see if the KPs stop. If they do, it's a software problem.




    For any of the possible culprit kernel extensions, it is not necessary to completely uninstall the parent program.


    (Note: disabling a kext this way may not always work as it may refuse to cooperate, but this is usually effective. The worst that will happen is you'll get a message saying it won't work.)



    You can temporarily uninstall any .kext, which may be causing the problem, by doing the following: Open Terminal in Applications>Utilties and copy/paste


    sudo kextunload


    Important, leave a space after kextunload


    Next, navigate to the /System/Library/ and select Extensions. Inside that folder, find the related .kext in question, which you should drag into the Terminal window. (After dragging it in, the file will stay where it belongs in its original location.) This will automatically fill the Terminal window with the name and path to the file.


    This is an example only of what the full command will then look like; it will not necessarily be found on your computer.


    sudo kextunload /System/Library/Extensions/PaceSupportFamily.kext/


    Hit return. If you have never used the sudo prefix before, you will get a warning, which you can disregard. Then enter your admin password, which you won't see on the screen as you type it in and hit return. Wait for the $ sign prompt to reappear, which will indicate the extension has been unloaded. Then just close the window.


    This will have the effect of disabling the program. If it fails to be the source of the problem, to reload/enable it, substitute kextload for kextunload, using the above procedure.


    Other than that, have a look at this article on resolving kernel panics. Faulty RAM is a frequent cause.

  • WZZZ Level 6 Level 6 (11,900 points)
    Currently Being Moderated
    Dec 30, 2012 3:51 PM (in response to jigzman)

    Well I would first start with uninstalling that program whatever that  is, since that's the main suspect. But preferably you want to use the uninstall directions provided by the developer, or an uninstaller from the dev, since it's got files deeply embedded in the system.


    If that doesn't do it, post back and I'll suggest a good way of testing the RAM.


    Do the KPs stop in Safe Boot?

  • WZZZ Level 6 Level 6 (11,900 points)
    Currently Being Moderated
    Dec 30, 2012 6:04 PM (in response to jigzman)

    You mean it's now uninstalled?


    To test the memory, get memtest and run it in single user mode, where it will test as much memory as possible, more than with the OS loaded.


    You can get memtest + directions from the link below. However, ignore running it from Terminal. Instead, boot into SU Mode, CMD-S at the startup chime. (Best to startup from a full shutdown.)


    At the prompt, simply type /usr/bin/memtest all 3 -L (From this link It will be installed in /usr/bin/) Then hit return. This will run three loops of memtest and create a log in Console in Utilties.


    If you want to run memtest longer, which may be advisable, since RAM errors can be very elusive, you can change the number of loops it runs by changing the number. For example, to run 8 loops you would enter /usr/bin/memtest all 8 -L.


    If you want to quit the test, just hit control-c


    When finished, you can just type in "reboot" and hit return.



    Direct link for the download.


  • WZZZ Level 6 Level 6 (11,900 points)
    Currently Being Moderated
    Dec 31, 2012 1:54 PM (in response to jigzman)

    Did it KP when you were in Safe Boot? You might want to stay there longer to see.


    Re. the Hardware Test. It's not known as a great diagnostic. If it gives you an error it can be trusted, but not necessarily the reverse.

  • WZZZ Level 6 Level 6 (11,900 points)
    Currently Being Moderated
    Dec 31, 2012 2:47 PM (in response to jigzman)

    OK, hope troubleshooting the RAM will help.  KPs can sometimes be very difficult to track down.


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