3 Replies Latest reply: May 21, 2013 7:00 AM by kontrastiv
kontrastiv Level 1 Level 1 (0 points)

I know there are a number of threads here speaking of similar problems, I've tried the steps mentioned there...to no avail.

 

I have an early 2009 iMac with a 24" display, 3.06 Ghz Core2 Duo. Memory has been upgraded to 8 GB.

 

The problem is: Since upgrading to Mountain Lion I get constant reboots, sometimes I can't even have the machine running for more than 30 minutes without it starting again. This is making it impossible for me to work. I've posted the last panic report at the end of this message. What I've noticed so far in all the panic messages is that the last loaded or unloaded extensions are always the same ones, no matter if my machine is restarting after 30 seconds or 4 hours. Could that be something helpful?

 

 

last loaded kext at 265295060056: com.apple.filesystems.msdosfs1.8 (addr 0xffffff7f8ddda000, size 65536)
last unloaded kext at 325721824096: com.apple.driver.AppleUSBCDC4.1.23 (addr 0xffffff7f8ddd7000, size 12288)

 

last loaded kext at 44096770537: com.apple.filesystems.smbfs1.8 (addr 0xffffff7f9ba79000, size 229376)
last unloaded kext at 320439081218: com.apple.driver.AppleFileSystemDriver3.0.1 (addr 0xffffff7f9d498000, size 8192)

 

last loaded kext at 60030157475: com.apple.filesystems.smbfs1.8 (addr 0xffffff7f93079000, size 229376)
last unloaded kext at 225334054274: com.apple.driver.AppleFileSystemDriver3.0.1 (addr 0xffffff7f94a98000, size 8192)

 

last loaded kext at 13865095949129: com.apple.driver.AppleUSBCDC4.1.23 (addr 0xffffff7fa0b81000, size 16384)
last unloaded kext at 13987394810384: com.apple.driver.AppleUSBCDC4.1.23 (addr 0xffffff7fa0b81000, size 12288)

 

last loaded kext at 10400723983581: com.apple.driver.AppleUSBCDC4.1.23 (addr 0xffffff7f89dc0000, size 16384)
last unloaded kext at 10603479350225: com.apple.driver.AppleUSBCDC4.1.23 (addr 0xffffff7f89dc0000, size 12288)

 

 

So it's ALWAYS either a file system extension or the USBCDC one. Always. Is that useless info or can I do some further testing in a specific direction here?

 

I've done the Apple Hardware Test in a loop for more than 8 hours without any problems, I've done a memtest in terminal without any problems. I've bootet in safe mode and still got a reboot. I've disconnected all external stuff (only using a Cintiq, a DAC with speakers and keyboard/mouse anyway)

 

Can anybody give me any more tips? Oh, and I've reinstalled Mountain Lion (clean install from recovery partition) a few times already. No change in behavior.

 

This is the very last crash report:

 

 

Tue Apr  9 21:46:50 2013

panic(cpu 1 caller 0xffffff800bcb7e95): Kernel trap at 0xffffff800bc401b1, type 14=page fault, registers:

CR0: 0x000000008001003b, CR2: 0xffffef80235e8130, CR3: 0x00000000996c1000, CR4: 0x0000000000000660

RAX: 0xffffef80235e8108, RBX: 0xffffff80235e80e8, RCX: 0xffffff80235e8108, RDX: 0xffffff8022aaedc8

RSP: 0xffffff80ee3cbe90, RBP: 0xffffff80ee3cbe90, RSI: 0xffffff80235e80e8, RDI: 0xffffff80240a0678

R8:  0xffffff8023ebf250, R9:  0x0000000000000003, R10: 0x0000000000000008, R11: 0x0000000000000206

R12: 0xffffff80235e80f0, R13: 0xffffff8023ebf248, R14: 0xffffff8022aaedc8, R15: 0xffffff80235e80e8

RFL: 0x0000000000010006, RIP: 0xffffff800bc401b1, CS:  0x0000000000000008, SS:  0x0000000000000010

Fault CR2: 0xffffef80235e8130, Error code: 0x0000000000000002, Fault CPU: 0x1

 

 

Backtrace (CPU 1), Frame : Return Address

0xffffff80ee3cbb30 : 0xffffff800bc1d626

0xffffff80ee3cbba0 : 0xffffff800bcb7e95

0xffffff80ee3cbd70 : 0xffffff800bccd4dd

0xffffff80ee3cbd90 : 0xffffff800bc401b1

0xffffff80ee3cbe90 : 0xffffff800bc40101

0xffffff80ee3cbee0 : 0xffffff800bc159fa

0xffffff80ee3cbf00 : 0xffffff800bc1ad4d

0xffffff80ee3cbf40 : 0xffffff800bc18edb

0xffffff80ee3cbf70 : 0xffffff800bca5dd6

0xffffff80ee3cbfb0 : 0xffffff800bccdd43

 

 

BSD process name corresponding to current thread: GrowlHelperApp

 

 

Mac OS version:

12D78

 

 

Kernel version:

Darwin Kernel Version 12.3.0: Sun Jan  6 22:37:10 PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64

Kernel UUID: 3EB7D8A7-C2D3-32EC-80F4-AB37D61492C6

Kernel slide:     0x000000000ba00000

Kernel text base: 0xffffff800bc00000

System model name: iMac9,1 (Mac-F2218FA9)

 

 

System uptime in nanoseconds: 8524868192710

last loaded kext at 265295060056: com.apple.filesystems.msdosfs          1.8 (addr 0xffffff7f8ddda000, size 65536)

last unloaded kext at 325721824096: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f8ddd7000, size 12288)

loaded kexts:

com.apple.filesystems.smbfs          1.8

com.apple.filesystems.ntfs          3.10

com.apple.driver.AGPM          100.12.87

com.apple.driver.AudioAUUC          1.60

com.apple.filesystems.autofs          3.0

com.apple.driver.AppleHWSensor          1.9.5d0

com.apple.driver.AppleHDA          2.3.7fc4

com.apple.driver.AppleUpstreamUserClient          3.5.10

com.apple.kext.AMDFramebuffer          8.1.0

com.apple.driver.AppleMikeyHIDDriver          122

com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.3f3

com.apple.driver.AppleMikeyDriver          2.3.7fc4

com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0

com.apple.driver.AppleLPC          1.6.0

com.apple.driver.AppleBacklight          170.2.5

com.apple.driver.AppleMCCSControl          1.1.11

com.apple.ATIRadeonX2000          8.1.0

com.apple.iokit.IOUserEthernet          1.0.0d1

com.apple.iokit.IOBluetoothSerialManager          4.1.3f3

com.apple.Dont_Steal_Mac_OS_X          7.0.0

com.apple.driver.ApplePolicyControl          3.3.0

com.apple.driver.AppleIRController          320.15

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1

com.apple.BootCache          34

com.apple.iokit.SCSITaskUserClient          3.5.5

com.apple.driver.XsanFilter          404

com.apple.iokit.IOAHCIBlockStorage          2.3.1

com.apple.driver.AppleUSBHub          5.5.5

com.apple.driver.AppleUSBEHCI          5.5.0

com.apple.driver.AppleFWOHCI          4.9.6

com.apple.driver.AirPort.Brcm4331          614.20.16

com.apple.driver.AppleAHCIPort          2.5.1

com.apple.nvenet          2.0.19

com.apple.driver.AppleUSBOHCI          5.2.5

com.apple.driver.AppleEFINVRAM          1.7

com.apple.driver.AppleHPET          1.8

com.apple.driver.AppleRTC          1.5

com.apple.driver.AppleACPIButtons          1.7

com.apple.driver.AppleSMBIOS          1.9

com.apple.driver.AppleACPIEC          1.7

com.apple.driver.AppleAPIC          1.6

com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0

com.apple.nke.applicationfirewall          4.0.39

com.apple.security.quarantine          2

com.apple.driver.AppleIntelCPUPowerManagement          196.0.0

com.apple.kext.triggers          1.0

com.apple.driver.DspFuncLib          2.3.7fc4

com.apple.iokit.IOFireWireIP          2.2.5

com.apple.driver.AppleUSBAudio          2.9.0f6

com.apple.iokit.IOAudioFamily          1.8.9fc11

com.apple.kext.OSvKernDSPLib          1.6

com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.3f3

com.apple.driver.AppleHDAController          2.3.7fc4

com.apple.iokit.IOHDAFamily          2.3.7fc4

com.apple.driver.IOPlatformPluginLegacy          1.0.0

com.apple.driver.AppleSMBusPCI          1.0.11d0

com.apple.driver.IOPlatformPluginFamily          5.3.0d51

com.apple.driver.AppleBacklightExpert          1.0.4

com.apple.driver.AppleSMBusController          1.0.11d0

com.apple.kext.AMD4800Controller          8.1.0

com.apple.kext.AMDSupport          8.1.0

com.apple.iokit.IOSurface          86.0.4

com.apple.iokit.IOSerialFamily          10.0.6

com.apple.iokit.IOBluetoothFamily          4.1.3f3

com.apple.driver.AppleSMC          3.1.4d2

com.apple.driver.AppleGraphicsControl          3.3.0

com.apple.iokit.IONDRVSupport          2.3.7

com.apple.iokit.IOGraphicsFamily          2.3.7

com.apple.driver.AppleUSBHIDKeyboard          170.2

com.apple.driver.AppleHIDKeyboard          170.2

com.apple.iokit.IOUSBHIDDriver          5.2.5

com.apple.driver.AppleUSBMergeNub          5.5.5

com.apple.driver.AppleUSBComposite          5.2.5

com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.5.5

com.apple.iokit.IOBDStorageFamily          1.7

com.apple.iokit.IODVDStorageFamily          1.7.1

com.apple.iokit.IOCDStorageFamily          1.7.1

com.apple.iokit.IOAHCISerialATAPI          2.5.1

com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5

com.apple.iokit.IOUSBUserClient          5.5.5

com.apple.iokit.IOFireWireFamily          4.5.5

com.apple.iokit.IO80211Family          522.4

com.apple.iokit.IOAHCIFamily          2.3.1

com.apple.iokit.IONetworkingFamily          3.0

com.apple.driver.NVSMU          2.2.9

com.apple.iokit.IOUSBFamily          5.5.5

com.apple.driver.AppleEFIRuntime          1.7

com.apple.iokit.IOHIDFamily          1.8.1

com.apple.iokit.IOSMBusFamily          1.1

com.apple.security.sandbox          220.2

com.apple.kext.AppleMatch          1.0.0d1

com.apple.security.TMSafetyNet          7

com.apple.driver.DiskImages          345

com.apple.iokit.IOStorageFamily          1.8

com.apple.driver.AppleKeyStore          28.21

com.apple.driver.AppleACPIPlatform          1.7

com.apple.iokit.IOPCIFamily          2.7.3

com.apple.iokit.IOACPIFamily          1.4

com.apple.kec.corecrypto          1.0

 


iMac (24-inch Early 2009), OS X Mountain Lion (10.8.3)
  • 1. Re: Constant reboots on my iMac (early 2009) with Mountain Lion. Why?
    kontrastiv Level 1 Level 1 (0 points)

    Update: It just happened again, this time while doing a backup with Time Machine. Could it be my Keyboard?

     

    I'm not using a Bluetooth keyboard, but one with a USB connection. Sometimes I'm connecting my backup drive to it, but reboots also happen without anything connected to the keyboard.

     

    This time there's even backtrace info:

     

    Thu Apr 11 14:36:46 2013

    panic(cpu 1 caller 0xffffff8016cb7e95): Kernel trap at 0xffffff8016c87717, type 14=page fault, registers:

    CR0: 0x000000008001003b, CR2: 0xffffef8022834ca0, CR3: 0x0000000019889000, CR4: 0x0000000000000660

    RAX: 0xffffff8022818b00, RBX: 0xffffef8022834c70, RCX: 0x0000000000000000, RDX: 0x0000000000000310

    RSP: 0xffffff8024093690, RBP: 0xffffff80240936b0, RSI: 0x0000000000000000, RDI: 0xffffff803002ea80

    R8:  0xffffff8029adb058, R9:  0x0000000000002000, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff

    R12: 0xffffff8024093790, R13: 0xffffff8029adb000, R14: 0xffffff803002ea80, R15: 0x0000000000000000

    RFL: 0x0000000000010202, RIP: 0xffffff8016c87717, CS:  0x0000000000000008, SS:  0x0000000000000010

    Fault CR2: 0xffffef8022834ca0, Error code: 0x0000000000000000, Fault CPU: 0x1

     

     

    Backtrace (CPU 1), Frame : Return Address

    0xffffff8024093330 : 0xffffff8016c1d626

    0xffffff80240933a0 : 0xffffff8016cb7e95

    0xffffff8024093570 : 0xffffff8016ccd4dd

    0xffffff8024093590 : 0xffffff8016c87717

    0xffffff80240936b0 : 0xffffff8016c83343

    0xffffff80240939d0 : 0xffffff8016f85e3e

    0xffffff8024093a20 : 0xffffff8016ce8c61

    0xffffff8024093aa0 : 0xffffff8016cdaf44

    0xffffff8024093ae0 : 0xffffff7f9720185b

    0xffffff8024093b30 : 0xffffff7f98e01f42

    0xffffff8024093b80 : 0xffffff7f98e059a6

    0xffffff8024093bd0 : 0xffffff7f972d2198

    0xffffff8024093c20 : 0xffffff7f972d2215

    0xffffff8024093c50 : 0xffffff7f98df17dd

    0xffffff8024093c80 : 0xffffff7f97514a98

    0xffffff8024093d50 : 0xffffff7f9761d5ea

    0xffffff8024093e10 : 0xffffff7f9761ecff

    0xffffff8024093eb0 : 0xffffff7f9761ed3f

    0xffffff8024093ed0 : 0xffffff7f97618f1b

    0xffffff8024093ef0 : 0xffffff80170467a8

    0xffffff8024093f30 : 0xffffff80170452aa

    0xffffff8024093f80 : 0xffffff80170453d9

    0xffffff8024093fb0 : 0xffffff8016cb2977

          Kernel Extensions in backtrace:

             com.apple.iokit.IOStorageFamily(1.8)[5BA4CD36-E96D-3A9E-ADFF-A863BBD63BC7]@0xff ffff7f971fe000->0xffffff7f97222fff

             com.apple.iokit.IOUSBFamily(5.5.5)[A276B40E-978D-3623-93D3-8621B3CEECFC]@0xffff ff7f97511000->0xffffff7f9756cfff

                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f9730f000

             com.apple.driver.AppleUSBEHCI(5.5)[220C65E6-AE76-38F5-88C5-B33FEC8E5061]@0xffff ff7f97615000->0xffffff7f9762cfff

                dependency: com.apple.iokit.IOUSBFamily(5.5.5)[A276B40E-978D-3623-93D3-8621B3CEECFC]@0xffff ff7f97511000

                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f9730f000

             com.apple.iokit.IOSCSIArchitectureModelFamily(3.5.5)[DCE95F6E-F7D4-33D8-9515-FB C4FF5B1AB4]@0xffffff7f972cd000->0xffffff7f972f7fff

             com.apple.iokit.IOUSBMassStorageClass(3.5.1)[30953382-7E86-3AEB-9485-A5621201C3 63]@0xffffff7f98def000->0xffffff7f98dfffff

                dependency: com.apple.iokit.IOUSBFamily(5.5.5)[A276B40E-978D-3623-93D3-8621B3CEECFC]@0xffff ff7f97511000

                dependency: com.apple.iokit.IOStorageFamily(1.8)[5BA4CD36-E96D-3A9E-ADFF-A863BBD63BC7]@0xff ffff7f971fe000

                dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(3.5.5)[DCE95F6E-F7D4-33D8-9515-FB C4FF5B1AB4]@0xffffff7f972cd000

             com.apple.iokit.IOSCSIBlockCommandsDevice(3.5.5)[07B0BD1F-3970-3AA0-B55A-D0D7D6 5FFB60]@0xffffff7f98e00000->0xffffff7f98e14fff

                dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(3.5.5)[DCE95F6E-F7D4-33D8-9515-FB C4FF5B1AB4]@0xffffff7f972cd000

                dependency: com.apple.iokit.IOStorageFamily(1.8)[5BA4CD36-E96D-3A9E-ADFF-A863BBD63BC7]@0xff ffff7f971fe000

     

     

    BSD process name corresponding to current thread: kernel_task

     

     

    Mac OS version:

    12D78

     

     

    Kernel version:

    Darwin Kernel Version 12.3.0: Sun Jan  6 22:37:10 PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64

    Kernel UUID: 3EB7D8A7-C2D3-32EC-80F4-AB37D61492C6

    Kernel slide:     0x0000000016a00000

    Kernel text base: 0xffffff8016c00000

    System model name: iMac9,1 (Mac-F2218FA9)

     

     

    System uptime in nanoseconds: 17790449382562

    last loaded kext at 11988722596011: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f98e15000, size 16384)

    last unloaded kext at 12049480700476: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f98e15000, size 12288)

    loaded kexts:

    com.apple.filesystems.smbfs          1.8

    com.apple.filesystems.ntfs          3.10

    com.apple.iokit.IOBluetoothSerialManager          4.1.3f3

    com.apple.driver.AudioAUUC          1.60

    com.apple.driver.AGPM          100.12.87

    com.apple.filesystems.autofs          3.0

    com.apple.driver.AppleMikeyHIDDriver          122

    com.apple.driver.AppleHDA          2.3.7fc4

    com.apple.driver.AppleHWSensor          1.9.5d0

    com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.3f3

    com.apple.iokit.IOUserEthernet          1.0.0d1

    com.apple.Dont_Steal_Mac_OS_X          7.0.0

    com.apple.driver.ApplePolicyControl          3.3.0

    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0

    com.apple.driver.AppleMikeyDriver          2.3.7fc4

    com.apple.driver.AppleLPC          1.6.0

    com.apple.driver.AppleBacklight          170.2.5

    com.apple.driver.AppleUpstreamUserClient          3.5.10

    com.apple.driver.AppleMCCSControl          1.1.11

    com.apple.kext.AMDFramebuffer          8.1.0

    com.apple.ATIRadeonX2000          8.1.0

    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1

    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1

    com.apple.BootCache          34

    com.apple.driver.AppleIRController          320.15

    com.apple.iokit.SCSITaskUserClient          3.5.5

    com.apple.driver.XsanFilter          404

    com.apple.iokit.IOAHCIBlockStorage          2.3.1

    com.apple.driver.AppleUSBHub          5.5.5

    com.apple.driver.AppleFWOHCI          4.9.6

    com.apple.driver.AirPort.Brcm4331          614.20.16

    com.apple.driver.AppleAHCIPort          2.5.1

    com.apple.nvenet          2.0.19

    com.apple.driver.AppleEFINVRAM          1.7

    com.apple.driver.AppleUSBEHCI          5.5.0

    com.apple.driver.AppleUSBOHCI          5.2.5

    com.apple.driver.AppleHPET          1.8

    com.apple.driver.AppleRTC          1.5

    com.apple.driver.AppleACPIButtons          1.7

    com.apple.driver.AppleSMBIOS          1.9

    com.apple.driver.AppleACPIEC          1.7

    com.apple.driver.AppleAPIC          1.6

    com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0

    com.apple.nke.applicationfirewall          4.0.39

    com.apple.security.quarantine          2

    com.apple.driver.AppleIntelCPUPowerManagement          196.0.0

    com.apple.iokit.IOSCSIBlockCommandsDevice          3.5.5

    com.apple.iokit.IOUSBMassStorageClass          3.5.1

    com.apple.iokit.IOSerialFamily          10.0.6

    com.apple.kext.triggers          1.0

    com.apple.driver.DspFuncLib          2.3.7fc4

    com.apple.iokit.IOFireWireIP          2.2.5

    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.3f3

    com.apple.driver.AppleUSBAudio          2.9.0f6

    com.apple.iokit.IOAudioFamily          1.8.9fc11

    com.apple.kext.OSvKernDSPLib          1.6

    com.apple.driver.AppleHDAController          2.3.7fc4

    com.apple.iokit.IOHDAFamily          2.3.7fc4

    com.apple.iokit.IOSurface          86.0.4

    com.apple.iokit.IOBluetoothFamily          4.1.3f3

    com.apple.driver.AppleSMC          3.1.4d2

    com.apple.driver.IOPlatformPluginLegacy          1.0.0

    com.apple.driver.AppleSMBusPCI          1.0.11d0

    com.apple.driver.IOPlatformPluginFamily          5.3.0d51

    com.apple.driver.AppleGraphicsControl          3.3.0

    com.apple.driver.AppleBacklightExpert          1.0.4

    com.apple.driver.AppleSMBusController          1.0.11d0

    com.apple.iokit.IONDRVSupport          2.3.7

    com.apple.kext.AMD4800Controller          8.1.0

    com.apple.kext.AMDSupport          8.1.0

    com.apple.iokit.IOGraphicsFamily          2.3.7

    com.apple.driver.AppleUSBHIDKeyboard          170.2

    com.apple.driver.AppleHIDKeyboard          170.2

    com.apple.iokit.IOUSBHIDDriver          5.2.5

    com.apple.driver.AppleUSBMergeNub          5.5.5

    com.apple.driver.AppleUSBComposite          5.2.5

    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.5.5

    com.apple.iokit.IOBDStorageFamily          1.7

    com.apple.iokit.IODVDStorageFamily          1.7.1

    com.apple.iokit.IOCDStorageFamily          1.7.1

    com.apple.iokit.IOAHCISerialATAPI          2.5.1

    com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5

    com.apple.iokit.IOUSBUserClient          5.5.5

    com.apple.iokit.IOFireWireFamily          4.5.5

    com.apple.iokit.IO80211Family          522.4

    com.apple.iokit.IOAHCIFamily          2.3.1

    com.apple.iokit.IONetworkingFamily          3.0

    com.apple.iokit.IOUSBFamily          5.5.5

    com.apple.driver.NVSMU          2.2.9

    com.apple.driver.AppleEFIRuntime          1.7

    com.apple.iokit.IOHIDFamily          1.8.1

    com.apple.iokit.IOSMBusFamily          1.1

    com.apple.security.sandbox          220.2

    com.apple.kext.AppleMatch          1.0.0d1

    com.apple.security.TMSafetyNet          7

    com.apple.driver.DiskImages          345

    com.apple.iokit.IOStorageFamily          1.8

    com.apple.driver.AppleKeyStore          28.21

    com.apple.driver.AppleACPIPlatform          1.7

    com.apple.iokit.IOPCIFamily          2.7.3

    com.apple.iokit.IOACPIFamily          1.4

    com.apple.kec.corecrypto          1.0

     

  • 2. Re: Constant reboots on my iMac (early 2009) with Mountain Lion. Why?
    mita44 Level 1 Level 1 (0 points)

    Hi,

     

    I do have the same problem.

    My iMac as a late 2009 version and it´s crashing sometimes 10 times a day,

    but then suddenly not crashing for 3 days.

    I tried everything,what I could find on the internet to solve the problem.

    Also my iMac has been at an Apple store for changing the HD as it was part

    of the official HD exchange programme.And my iMac was tested at the Apple store

    and they didn´t find any problem.

    I started my iMac from an external completely new system, also didn´t help.

     

    I believe there must be a problem, which is cause by a bad hardware part,

    which is not found by the Apple hardware test for some reasons.

     

    Funnily my display has been exchanged on warranty 2 times, because it had some

    grey pixels and so actually I am using the 3rd display now and the 2nd HD.

     

    Waiting until this machine dies and then I see what I do...

     

    Michael

  • 3. Re: Constant reboots on my iMac (early 2009) with Mountain Lion. Why?
    kontrastiv Level 1 Level 1 (0 points)

    Howdy,

     

    I think I found out what was the problem for me.

     

    After changing/unplugging the peripherals and swapping the hard drive it was still giving me reboots.

     

    So the last thing to change (apart from the mainboard) was the RAM. This seemed to have helped, even though the old RAM seems to work fine in my laptops. Since a few days there are no reboots now. Funny that there was no faulty RAM discovered, even when running the hardware test for many hours.

     

    In any case, things seem to work now. I just wish that the crash reports would have pointed me in the right direction.