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Mac Pro freezes or restarts shortly after startup

1481 Views 13 Replies Latest reply: Nov 22, 2012 1:02 AM by dmdimon RSS Branched to a new discussion.
Jacob Eikelenboom Calculating status...
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May 12, 2012 8:59 AM



My Mac Pro has developed a habit of freezing (including mouse pointer) a while (some 10 minutes) after powering on the machine. After a forced restart the problem has disappeared for the rest of the day. On some days the computer spontaneously restarts a while after powering on and then the problem is more persistent, with the light on the front flashing and the machine not getting through powering up at all. What then helps is removing and putting back the video card. I have already replaced the video card with a new one, after which the problem had disappeared for several weeks, but now it is fully back again.


Several runs with TechTool Pro did not reveal any hardware problem.


Can someone advise on how to diagnose the freezes etc. or even how to solve it?


Below is an error report produced after a forced restart.


Thanks for any answers!



Interval Since Last Panic Report:  493877 sec

Panics Since Last Report:          1

Anonymous UUID:                    D7488D0B-AFE4-4AEF-B57E-147CF4D971A0


Tue May  8 20:01:18 2012

Machine-check capabilities (cpu 6) 0x0000000000000806:

family: 6 model: 23 stepping: 6 microcode: 1547

Intel(R) Xeon(R) CPU           E5462  @ 2.80GHz

6 error-reporting banks

threshold-based error status present

Machine-check status 0x0000000000000005:

restart IP valid

machine-check in progress

MCA error-reporting registers:

IA32_MC0_STATUS(0x401): 0x1000000020000000 invalid

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): 0xb200000084200e0f valid

  MCA error code:            0x0e0f

  Model specific error code: 0x8420

  Other information:         0x00000000

  Threshold-based status:    Undefined

  Status bits:

   Processor context corrupt

   Error enabled

   Uncorrected error

panic(cpu 6 caller 0xffffff80002c2c95): "Machine Check at 0xffffff7f8192d876, registers:\n" "CR0: 0x0000000080010033, CR2: 0x0000000000099000, CR3: 0x00000000268f2000, CR4: 0x0000000000000660\n" "RAX: 0x0000000000000000, RBX: 0x0000000000000000, RCX: 0x0000000000000001, RDX: 0x0000000000000000\n" "RSP: 0xffffff80f23fbc10, RBP: 0xffffff80f23fbc40, RSI: 0x0000000000000001, RDI: 0xffffff80e9afe148\n" "R8:  0xffffff8013f2c000, R9:  0xffffff80157da180, R10: 0x0000000000000c00, R11: 0xffffff80002d8220\n" "R12: 0x0000000000000001, R13: 0x0000000000000148, R14: 0xffffff8013f2c000, R15: 0xffffff8013da5040\n" "RFL: 0x0000000000000046, RIP: 0xffffff7f8192d876, CS:  0x0000000000000008, SS:  0x0000000000000010\n" "Error code: 0x0000000000000000\n"@/SourceCache/xnu/xnu-1699.24.23/osfmk/i386/trap_native.c: 278

Backtrace (CPU 6), Frame : Return Address

0xffffff80e9b0dec0 : 0xffffff8000220702

0xffffff80e9b0df40 : 0xffffff80002c2c95

0xffffff80e9b0e0a0 : 0xffffff80002d83ef

0xffffff80f23fbc40 : 0xffffff7f8192643e

0xffffff80f23fbd20 : 0xffffff7f81927f68

0xffffff80f23fbdd0 : 0xffffff80002c41d4

0xffffff80f23fbdf0 : 0xffffff800022d2e5

0xffffff80f23fbe30 : 0xffffff800022dfd0

0xffffff80f23fbe90 : 0xffffff800022f383

0xffffff80f23fbef0 : 0xffffff80002157ff

0xffffff80f23fbf10 : 0xffffff800021bc5a

0xffffff80f23fbf70 : 0xffffff80002aeb80

0xffffff80f23fbfb0 : 0xffffff80002d8383

      Kernel Extensions in backtrace:
[E08EC0D7-C364-3C57-A377-88 7B36241B1C]@0xffffff7f81924000->0xffffff7f8194dfff


BSD process name corresponding to current thread: WindowServer


Mac OS version:



Kernel version:

Darwin Kernel Version 11.3.0: Thu Jan 12 18:47:41 PST 2012; root:xnu-1699.24.23~1/RELEASE_X86_

Model: MacPro3,1, BootROM MP31.006C.B05, 8 processors, Quad-Core Intel Xeon, 2.8 GHz, 8 GB, SMC 1.25f4

Graphics: ATI Radeon HD 4870, ATI Radeon HD 4870, PCIe, 1024 MB

Memory Module: DIMM Riser B/DIMM 1, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335

Memory Module: DIMM Riser B/DIMM 2, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335

Memory Module: DIMM Riser A/DIMM 1, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335

Memory Module: DIMM Riser A/DIMM 2, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335

Memory Module: DIMM Riser A/DIMM 3, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x055D, 0x41505F4D503830305F424947320000000000

Memory Module: DIMM Riser A/DIMM 4, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x055D, 0x41505F4D503830305F424947320000000000

Bluetooth: Version 4.0.3f12, 2 service, 11 devices, 1 incoming serial ports

Network Service: Ethernet 1, Ethernet, en0

PCI Card: ATI Radeon HD 4870, sppci_displaycontroller, Slot-1

PCI Card: ATI Radeon HD 4870, ATY,MotmotParent, Slot-1

Serial ATA Device: ST3500630AS P, 500,11 GB

Serial ATA Device: ST31000528AS, 1 TB

Parallel ATA Device: OPTIARC DVD RW AD-7170A

USB Device: WinTV HVR-900, 0x2040  (Hauppauge Computer Works, Inc.), 0x6502, 0xfd400000 / 3

USB Device: hub_device, apple_vendor_id, 0x9131, 0xfd300000 / 2

USB Device: Keyboard Hub, apple_vendor_id, 0x1006, 0xfd330000 / 6

USB Device: Apple Optical USB Mouse, apple_vendor_id, 0x0304, 0xfd333000 / 8

USB Device: Apple Keyboard, apple_vendor_id, 0x0221, 0xfd332000 / 7

USB Device: iP4700 series, 0x04a9  (Canon Inc.), 0x10d2, 0xfd310000 / 5

USB Device: Apple Cinema HD Display, apple_vendor_id, 0x9223, 0xfd320000 / 4

USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8206, 0x5d200000 / 3

USB Device: SoundSticks, 0x05fc  (Harman International), 0x7849, 0x5d100000 / 2

FireWire Device: built-in_hub, 800mbit_speed

FireWire Device: unknown_device, unknown_speed

Mac Pro (Early 2008), Mac OS X (10.7.2)
  • Linc Davis Level 10 Level 10 (108,150 points)

    Make a "Genius" appointment at an Apple Store to have the machine tested.


    Print the first page of the panic report and bring it with you.


    Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros (do this only if you know how to restore, and you have at least two independent backups.) Don’t erase the Lion recovery partition, if present.

  • Grant Bennet-Alder Level 8 Level 8 (48,180 points)

    It is not definitive, but that crash report has the look of an uncorrectable memory error.


    You have omitted the list of kexts loaded, so it is difficult to determine whether you have known problem software loaded. The full report is large, but it is all text and would be more helpful.


    Also, the side door is not interlocked, and can be removed while the Mac Is running so that you can look for error lights next to your memory modules. There are no hazardous Voltages accessible to your unaided fingers (per UL regulations) but components may be quite hot.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • Linc Davis Level 10 Level 10 (108,150 points)

    You can try the Apple Hardware Test. It's not reliable.

  • Grant Bennet-Alder Level 8 Level 8 (48,180 points)
    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • japamac Level 7 Level 7 (24,390 points)

    Remove the DIMMs from the A Riser, slots 3 and 4. That would be the pair of 2 GB DIMMs.

    Try and replicate the crash with those DIMMs removed.

  • Grant Bennet-Alder Level 8 Level 8 (48,180 points)

    Thanks for posting that. I know it is a bit of work to get it.


    It shows you have ONLY Apple kexts in your machine. so this problem cannot be blamed on third-party software. It is very likely to be an uncorrectable memory error.


    The fault is a machine check, it is an uncorrected error, and several of the other registers have the look of an uncorrectable memory error.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • japamac Level 7 Level 7 (24,390 points)

    Did you try the RAM reconfiguration as I suggested?

    Have you used Memtest X to see if the errors emanate from the RAM?


    The errors can be due to faulty RAM (common with FB-DIMMs) or due to damaged risers.

    The errors can also be due to overheat (common with FB-DIMMs).

  • The hatter Level 9 Level 9 (58,600 points)

    this is a 2008. Therefore it uses FBDIMMs too.


    Both 2008s, which seem to be getting reported very often lately; and heat from FBDIMMs and that they do tend to suffer from 4 yrs of stress (cold-hot-cold cycles are very stressful, and they generate a lot of heat, each DIMM uses 10-15W and needs to be kept below 72*C, one reason to use SmcFanControl 2.3+ and Hardware Monitor).


    MCA error-reporting registers = RAM error.


    You took out the 2 x 2GB for a period? okay, now swap and uses those and pull the 4 x 1GB.


    And for $100 Amazon has 4x2GB set, they are 'only' 667MHz but good quality and proper Mac Pro etc - ideal is of course 8 DIMMs for best memory bandwidth regardless.


    The ATI 4870s don't get mentioned much, so that should be hopeful it is fine.


    TechTool Pro: have yet to see/hear of it really finding hardware problems - owned since it was MacEKG too sadly - but I would still run memtest or its GUI cousin Rember.


    AHT: if the Riser,motherboard, or thermal sensor was the cause, or you had parity errors it would, but not much else otherwise.


    The trouble with those restarts is they really should be followed by Safe Boot once, and then a restart. Whatever temp and cache files were written will be recreated and those use and can be the source of trouble, plus recheck the journal and directory in the process.


    How old the disk drive, when last initialized, and if a full media scan for bad sectors was ever done too in the course of ruling out and troubleshoot steps.


    I like to see any computer, esp. these, on 850W or better UPS definitely. And not sharing the outlet or circuit with much else (ie, nothing heavy either like room a/c).

  • dmdimon Level 3 Level 3 (840 points)

    Bad cache, cache-to memory sync, so bad processor or mem controller

    Screen Shot 2012-11-22 at 1.41.28 PM.png


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