Resolved Advice : Mac Pro 2013 (6,1) : Random boots with no video

[RxJemm]

Good night,

Hoping someone has idea what could be going on with my 6,1 Mac Pro. Thank you in advance for any insight you can provide!

Machine

A 2013 Mac Pro that I purchased used from Amazon in early 2015. It was a returned model, with only a slight blemish on the back. It was the quad core 3.7Ghz model with 12GB of RAM, 256GB SSD and two D300s. All was well for 3 years. I basically had no issues except for a few sleep wake problems which I attributed to my Dell 2715Q monitor (known fault).

2018 : The upgrades

In October, I decided to upgrade the cpu, ssd, and ram with a 3.0Ghz 10-core Xeon E5-2690 v2 cpu, Samsung 960 Evo 512GB SSD in the sintech adapter, and 32GB of OWC RAM. The upgrade went ok, I do not recall damaging anything. However I noticed that the coin cell battery was dislodged and free in the I/O board cage. It was obviously dislodged for some time, as it was corroded and had to be replaced with a CR-2032 (no BR-2032s are available where I live). This may have happened in shipping way back in 2015. Shortly after the upgrade I started to notice these symptoms:

Symptoms : Random boots with no video and kernel panics when in resuming from sleep or the screensaver

Shortly after the upgrade I started to notice the above issue. The machine will sometimes start and boot to the login prompt, with no video on any thunderbolt port or the HDMI. The apple logo does not appear. I can hear the error "bong" when I press enter at the login screen and remote connecting with Screen Sharing from my wife's iMac brings up the login screen so I know the mac is booting into the OS. When it does boot with video, I can run Cinebench and Luxmark and basically any application without it crashing*. I get no visual artefacts on the display at all.
* as of a few hours ago, Chrome hung twice. Not sure if this is a chrome thing. The Mac had to be hard reset.

What I have done to troubleshoot...

• Tried different monitors and cables.
• Removed all connected peripherals.
• I ran the Apple Hardware Test (AHT) twice and the results were all negative.
• Removed the OCZ ram and put back in the stock RAM sticks one at a time. No change.
• I was stuck at an earlier bootrom version due to the fact that I did not have an OEM SSD (the original was placed in my wife's iMac to make a Fusion drive). Today I was able to purchase an Apple SSUBX 256GB Mac Pro SSD to facilitate the bootrom upgrade to the latest 127.0.0.0.0. No change, issues persist
• Fresh installs of High Sierra and various revisions of Mojave make no difference.
• Resetting the SMC does not help.
• Turning up the fan with SMC-fan does nothing.
• HOWEVER, I can get the monitor to display 100% of the time by resetting the NVram with the Command-Option-PR salute!
• Multiple torture testing this time with LuxMark doing OpenCL renders using the CPU only passes with no hangups or panics.
• Updated to 10.14.4 with the 128.0.0.0.0 BootRom. Problem persists. (March 2, 2019)
• Updated to the 129.0.0.0.0 BootRom in the latest 10.4.4 beta (March 9, 2019)
• Noticed that USB devices that draw more current such as hard drives and the webcam drastically reduce the frequency with which the Mac does not boot with video! (March 9, 2019)
• Got around a stripped logic board screw and was finally able to change the CPU back to the stock 3.7Ghz quad core model. So far, so good! (May 25, 2019)

System info dump

Model: MacPro6,1, BootROM 127.0.0.0.0, 10 processors, 10-Core Intel Xeon E5, 3 GHz, 32 GB, SMC 2.20f18
Graphics: AMD FirePro D300, AMD FirePro D300, PCIe
Graphics: AMD FirePro D300, AMD FirePro D300, PCIe
Memory Module: DIMM1, 8 GB, DDR3 ECC, 1866 MHz, 0x80CE, 0x4D33393342314737305148302D434D412020
Memory Module: DIMM2, 8 GB, DDR3 ECC, 1866 MHz, 0x80CE, 0x4D33393342314737305148302D434D412020
Memory Module: DIMM3, 8 GB, DDR3 ECC, 1866 MHz, 0x80CE, 0x4D33393342314737305148302D434D412020
Memory Module: DIMM4, 8 GB, DDR3 ECC, 1866 MHz, 0x80CE, 0x4D33393342314737305148302D434D412020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x135), Broadcom BCM43xx 1.0 (7.77.61.1 AirPortDriverBrcmNIC-1305.2)
Bluetooth: Version 6.0.10f1, 3 services, 27 devices, 1 incoming serial ports
Network Service: Ethernet Bond (bond0), Ethernet, bond0
PCI Card: AMD FirePro D300, Display Controller, Slot-1
PCI Card: AMD FirePro D300, Display Controller, Slot-2
Serial ATA Device: APPLE SSD SM0256G, 251 GB
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
USB Device: USB 3.0 Bus
Thunderbolt Bus: Mac Pro, Apple Inc., 19.2
Thunderbolt Bus: Mac Pro, Apple Inc., 19.2
Thunderbolt Bus: Mac Pro, Apple Inc., 19.2

My last kernel panic report:

Anonymous UUID:       350E3016-42C1-8689-6032-14F40EF8A444

Sat Feb  9 18:50:42 2019

*** Panic Report ***
panic(cpu 0 caller 0xffffff80126da29d): Kernel trap at 0xffffff7f953f6ac7, type 14=page fault, registers:
CR0: 0x0000000080010033, CR2: 0x0000000000000000, CR3: 0x0000000637766052, CR4: 0x00000000001626e0
RAX: 0xffffff7f953f6aaa, RBX: 0x0000000000000000, RCX: 0x0000000000000020, RDX: 0xffffff7f95841aa0
RSP: 0xffffff83d4233870, RBP: 0xffffff83d4233980, RSI: 0xffffff8085603608, RDI: 0xffffff8085603000
R8:  0x0000001000002ba7, R9:  0x0000000000000000, R10: 0xffffff839d1d3100, R11: 0x0000000000000000
R12: 0xffffff8085603000, R13: 0xffffff8085603000, R14: 0xffffff8085603608, R15: 0xffffff8085603608
RFL: 0x0000000000010282, RIP: 0xffffff7f953f6ac7, CS:  0x0000000000000008, SS:  0x0000000000000010
Fault CR2: 0x0000000000000000, Error code: 0x0000000000000000, Fault CPU: 0x0, PL: 0, VF: 0

Backtrace (CPU 0), Frame : Return Address
0xffffff83d4233340 : 0xffffff80125aeb0d
0xffffff83d4233390 : 0xffffff80126e8653
0xffffff83d42333d0 : 0xffffff80126da07a
0xffffff83d4233440 : 0xffffff801255bca0
0xffffff83d4233460 : 0xffffff80125ae527
0xffffff83d4233580 : 0xffffff80125ae373
0xffffff83d42335f0 : 0xffffff80126da29d
0xffffff83d4233760 : 0xffffff801255bca0
0xffffff83d4233780 : 0xffffff7f953f6ac7
0xffffff83d4233980 : 0xffffff7f953195d5
0xffffff83d42339c0 : 0xffffff7f95319ae7
0xffffff83d42339f0 : 0xffffff7f95316c30
0xffffff83d4233a80 : 0xffffff8012c8779c
0xffffff83d4233ae0 : 0xffffff8012c859c0
0xffffff83d4233b30 : 0xffffff8012c8ecdf
0xffffff83d4233c70 : 0xffffff8012694c64
0xffffff83d4233d80 : 0xffffff80125b43ed
0xffffff83d4233dd0 : 0xffffff801258ebe5
0xffffff83d4233e50 : 0xffffff80125a35ae
0xffffff83d4233ef0 : 0xffffff80126c17bb
0xffffff83d4233fa0 : 0xffffff801255c486
      Kernel Extensions in backtrace:
         com.apple.iokit.IOAcceleratorFamily2(404.2.2)[3F0DBC5F-414B-379E-8C7B-A2F50B278A2A]@0xffffff7f95312000->0xffffff7f953b6fff
            dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[A2492141-9480-3177-BC7D-455925BB4A2E]@0xffffff7f93382000
            dependency: com.apple.iokit.IOSurface(255.1)[12B5957C-3874-3A96-8FC6-FAC2180790A9]@0xffffff7f952ee000
            dependency: com.apple.iokit.IOPCIFamily(2.9)[5C9A453F-559B-3683-9E81-D288D13A33CE]@0xffffff7f92e95000
            dependency: com.apple.iokit.IOGraphicsFamily(530.14)[D44517BE-2B53-3BD5-826E-4E78B55E3B73]@0xffffff7f9362b000
            dependency: com.apple.iokit.IOReportFamily(47)[5F165AE5-F4F2-3415-857C-34F2462A730E]@0xffffff7f939c5000
         com.apple.kext.AMDRadeonX4000(2.0.4)[72D8FB63-8A63-38CB-8D53-01E07205BCAE]@0xffffff7f953c7000->0xffffff7f95887fff
            dependency: com.apple.iokit.IOSurface(255.1)[12B5957C-3874-3A96-8FC6-FAC2180790A9]@0xffffff7f952ee000
            dependency: com.apple.iokit.IOPCIFamily(2.9)[5C9A453F-559B-3683-9E81-D288D13A33CE]@0xffffff7f92e95000
            dependency: com.apple.iokit.IOGraphicsFamily(530.14)[D44517BE-2B53-3BD5-826E-4E78B55E3B73]@0xffffff7f9362b000
            dependency: com.apple.iokit.IOAcceleratorFamily2(404.2.2)[3F0DBC5F-414B-379E-8C7B-A2F50B278A2A]@0xffffff7f95312000

BSD process name corresponding to current thread: ScreensharingAge

Mac OS version:
18D109

Kernel version:
Darwin Kernel Version 18.2.0: Thu Dec 20 20:46:53 PST 2018; root:xnu-4903.241.1~1/RELEASE_X86_64
Kernel UUID: 1970B070-E53F-3178-83F3-1B95FA340695
Kernel slide:     0x0000000012200000
Kernel text base: 0xffffff8012400000
__HIB  text base: 0xffffff8012300000
System model name: MacPro6,1 (Mac-F60DEB81FF30ACF6)

System uptime in nanoseconds: 1181420789198
last loaded kext at 518064001039: com.apple.driver.AppleXsanScheme    3 (addr 0xffffff7f98e83000, size 32768)
last unloaded kext at 847069991751: com.apple.driver.AppleXsanScheme    3 (addr 0xffffff7f98e83000, size 32768)
loaded kexts:
com.apple.driver.AppleTopCaseHIDEventDriver    138.2
com.apple.driver.AudioAUUC    1.70
com.apple.fileutil    18.306.12
com.apple.filesystems.autofs    3.0
com.apple.driver.AGPM    110.23.46
com.apple.driver.ApplePlatformEnabler    2.7.0d0
com.apple.driver.X86PlatformShim    1.0.0
com.apple.driver.AppleUpstreamUserClient    3.6.5
com.apple.driver.AppleMCCSControl    1.5.6
com.apple.kext.AMDFramebuffer    2.0.4
com.apple.kext.AMDRadeonX4000    2.0.4
com.apple.driver.AppleGraphicsDevicePolicy    3.28.4
com.apple.AGDCPluginDisplayMetrics    3.28.4
com.apple.driver.AppleHDA    282.10
com.apple.driver.AppleHV    1
com.apple.iokit.IOUserEthernet    1.0.1
com.apple.iokit.IOBluetoothSerialManager    6.0.10f1
com.apple.driver.eficheck    1
com.apple.driver.pmtelemetry    1
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AppleThunderboltIP    3.1.2
com.apple.driver.AppleLPC    3.1
com.apple.kext.AMD7000Controller    2.0.4
com.apple.driver.AppleOSXWatchdog    1
com.apple.driver.AppleMGPUPowerControl    3.28.4
com.apple.driver.AppleIntelSlowAdaptiveClocking    4.0.0
com.apple.driver.AppleIntelMCEReporter    107
com.apple.filesystems.apfs    945.241.4
com.apple.driver.AppleVirtIO    2.1.3
com.apple.filesystems.hfs.kext    407.200.4
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.BootCache    40
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0
com.apple.AppleSystemPolicy    1.0
com.apple.iokit.AppleBCM5701Ethernet    10.3.3
com.apple.driver.AirPort.BrcmNIC    1400.1.1
com.apple.driver.AppleAHCIPort    329.200.2
com.apple.private.KextAudit    1.0
com.apple.driver.AppleACPIEC    6.1
com.apple.driver.AppleACPIButtons    6.1
com.apple.driver.AppleHPET    1.8
com.apple.driver.AppleRTC    2.0
com.apple.driver.AppleSMBIOS    2.1
com.apple.driver.AppleAPIC    1.7
com.apple.driver.AppleIntelCPUPowerManagementClient    220.0.0
com.apple.nke.applicationfirewall    190
com.apple.security.TMSafetyNet    8
com.apple.driver.AppleIntelCPUPowerManagement    220.0.0
com.apple.driver.AppleHIDKeyboard    208
com.apple.driver.AppleActuatorDriver    2410.5
com.apple.driver.AppleMultitouchDriver    2410.5
com.apple.driver.AppleInputDeviceSupport    2410.2
com.apple.driver.AppleHSBluetoothDriver    138.2
com.apple.driver.IOBluetoothHIDDriver    6.0.10f1
com.apple.kext.triggers    1.0
com.apple.driver.AppleSMBusController    1.0.18d1
com.apple.kext.AMDRadeonX4030HWLibs    1.0
com.apple.iokit.IOAcceleratorFamily2    404.2.2
com.apple.kext.AMDRadeonX4000HWServices    2.0.4
com.apple.driver.DspFuncLib    282.10
com.apple.kext.OSvKernDSPLib    527
com.apple.iokit.IOAVBFamily    710.1
com.apple.plugin.IOgPTPPlugin    700.7
com.apple.driver.AppleSSE    1.0
com.apple.iokit.IOSurface    255.1
com.apple.driver.AppleHDAController    282.10
com.apple.iokit.IOHDAFamily    282.10
com.apple.kext.AMDSupport    2.0.4
com.apple.driver.AppleGraphicsControl    3.28.4
com.apple.driver.AppleBacklightExpert    1.1.0
com.apple.iokit.IONDRVSupport    530
com.apple.driver.X86PlatformPlugin    1.0.0
com.apple.driver.IOPlatformPluginFamily    6.0.0d8
com.apple.AppleGPUWrangler    3.28.4
com.apple.AppleGraphicsDeviceControl    3.28.4
com.apple.iokit.IOGraphicsFamily    530.14
com.apple.iokit.IOSlowAdaptiveClockingFamily    1.0.0
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport    6.0.10f1
com.apple.iokit.IOBluetoothHostControllerUSBTransport    6.0.10f1
com.apple.iokit.IOBluetoothHostControllerTransport    6.0.10f1
com.apple.iokit.IOBluetoothFamily    6.0.10f1
com.apple.iokit.IOAudioFamily    206.5
com.apple.vecLib.kext    1.2.0
com.apple.driver.usb.networking    5.0.0
com.apple.driver.usb.AppleUSBHub    1.2
com.apple.driver.AppleThunderboltDPInAdapter    5.5.8
com.apple.driver.AppleThunderboltDPAdapterFamily    5.5.8
com.apple.driver.AppleThunderboltPCIDownAdapter    2.1.4
com.apple.iokit.IOSerialFamily    11
com.apple.driver.AppleThunderboltNHI    4.7.6
com.apple.iokit.IOThunderboltFamily    6.8.1
com.apple.filesystems.hfs.encodings.kext    1
com.apple.iokit.IOAHCIBlockStorage    301.200.2
com.apple.driver.usb.AppleUSBXHCIPCI    1.2
com.apple.driver.usb.AppleUSBXHCI    1.2
com.apple.iokit.IOEthernetAVBController    1.1.0
com.apple.iokit.IO80211Family    1200.12.2
com.apple.driver.mDNSOffloadUserClient    1.0.1b8
com.apple.driver.corecapture    1.0.4
com.apple.driver.usb.AppleUSBEHCIPCI    1.2
com.apple.driver.usb.AppleUSBEHCI    1.2
com.apple.iokit.IOAHCIFamily    288
com.apple.driver.usb.AppleUSBHostPacketFilter    1.0
com.apple.iokit.IOUSBFamily    900.4.2
com.apple.driver.AppleUSBHostMergeProperties    1.2
com.apple.driver.AppleEFINVRAM    2.1
com.apple.iokit.IOSMBusFamily    1.1
com.apple.iokit.IOHIDFamily    2.0.0
com.apple.driver.AppleEFIRuntime    2.1
com.apple.security.quarantine    3
com.apple.security.sandbox    300.0
com.apple.kext.AppleMatch    1.0.0d1
com.apple.driver.DiskImages    493.0.0
com.apple.driver.AppleFDEKeyStore    28.30
com.apple.driver.AppleEffaceableStorage    1.0
com.apple.driver.AppleKeyStore    2
com.apple.driver.AppleUSBTDM    456.230.1
com.apple.driver.AppleMobileFileIntegrity    1.0.5
com.apple.kext.CoreTrust    1
com.apple.iokit.IOUSBMassStorageDriver    145.200.2
com.apple.iokit.IOSCSIBlockCommandsDevice    408.200.1
com.apple.iokit.IOSCSIArchitectureModelFamily    408.200.1
com.apple.iokit.IOStorageFamily    2.1
com.apple.driver.AppleCredentialManager    1.0
com.apple.driver.KernelRelayHost    1
com.apple.iokit.IOUSBHostFamily    1.2
com.apple.driver.usb.AppleUSBCommon    1.0
com.apple.driver.AppleBusPowerController    1.0
com.apple.driver.AppleSEPManager    1.0.1
com.apple.driver.IOSlaveProcessor    1
com.apple.iokit.IOReportFamily    47
com.apple.iokit.IOTimeSyncFamily    700.7
com.apple.iokit.IONetworkingFamily    3.4
com.apple.driver.AppleACPIPlatform    6.1
com.apple.driver.AppleSMC    3.1.9
com.apple.iokit.IOPCIFamily    2.9
com.apple.iokit.IOACPIFamily    1.4
com.apple.kec.pthread    1
com.apple.kec.Libm    1
com.apple.kec.corecrypto    1.0

Possibilities?

• Could the I/O board have been damaged by the loose coin-cell battery..
• The 10-core CPU may be faulty in some way. It was a server pull from Ebay.

Thoughts? thanks in advance!

 

[handheldgames]

Have you tried reinstalling the original CPU? Perhaps the new CPU has issues.

 

[RxJemm]

Have you tried reinstalling the original CPU? Perhaps the new CPU has issues.

Hi handheldgames, I have not done that as yet. Might be worth the try! TsiAlex recently pointed out that a new bootrom (128.0.0.0.0) is available with the beta of 10.4.4. I am going to wait on that and see if that makes a difference before I do the CPU swap.

Thanks

 

[RxJemm]

Hi all, the problem is persisting despite the new 128.0.0.0.0 BootRom in 10.14.4.. Time to swap back in the original CPU!

 

[sdshannon]

Hi all, the problem is persisting despite the new 128.0.0.0.0 BootRom in 10.14.4.. Time to swap back in the original CPU!

I have had similar issue with my 6 core. I had a 970 pro installed and after 10.14.3 update I noticed restarts very much like you described. So I put the original back in and it still did it. I did a fresh install of the OS and that seemed to fix the problem up until tonight. It was ok for about 2 weeks. Im interested in how yours turned out after re-installing the original CPU.

 

[RxJemm]

Hi sdshannon!
Thanks for the reply,

I have not changed the CPU as yet, but I updated to the 129.0.0.0 BootRom:

Model Name: Mac Pro
Model Identifier: MacPro6,1
Processor Name: 10-Core Intel Xeon E5
Processor Speed: 3 GHz
Number of Processors: 1
Total Number of Cores: 10
L2 Cache (per Core): 256 KB
L3 Cache: 25 MB
Memory: 32 GB
Boot ROM Version: 129.0.0.0.0
SMC Version (system): 2.20f18
Illumination Version: 1.4a6
Serial Number (system): F5KNM0CG****

The bootloader update has not made a difference, but of note having devices plugged into to these two USB3 ports (picture) drastically reduces the frequency with which it will boot without video! Think this may point to an issue with the I/O board.... thoughts??

 

[tsialex]

Hi sdshannon!
Thanks for the reply,

I have not changed the CPU as yet, but I updated to the 129.0.0.0 bootloader:

Model Name: Mac Pro
Model Identifier: MacPro6,1
Processor Name: 10-Core Intel Xeon E5
Processor Speed: 3 GHz
Number of Processors: 1
Total Number of Cores: 10
L2 Cache (per Core): 256 KB
L3 Cache: 25 MB
Memory: 32 GB
Boot ROM Version: 129.0.0.0.0
SMC Version (system): 2.20f18
Illumination Version: 1.4a6
Serial Number (system): F5KNM0CG****

The bootloader update has not made a difference, but of note having devices plugged into to these two USB3 ports (picture) drastically reduces the frequency with which it will boot without video! Think this may point to an issue with the I/O board.... thoughts??

BootROM, not bootloader. Bootloader is the file that controls what to boot and is stored into the EFI partition.

 

[RxJemm]

oops! corrected!

 

[sdshannon]

Hi sdshannon!
Thanks for the reply,

I have not changed the CPU as yet, but I updated to the 129.0.0.0 BootRom:

Model Name: Mac Pro
Model Identifier: MacPro6,1
Processor Name: 10-Core Intel Xeon E5
Processor Speed: 3 GHz
Number of Processors: 1
Total Number of Cores: 10
L2 Cache (per Core): 256 KB
L3 Cache: 25 MB
Memory: 32 GB
Boot ROM Version: 129.0.0.0.0
SMC Version (system): 2.20f18
Illumination Version: 1.4a6
Serial Number (system): F5KNM0CG****

The bootloader update has not made a difference, but of note having devices plugged into to these two USB3 ports (picture) drastically reduces the frequency with which it will boot without video! Think this may point to an issue with the I/O board.... thoughts??

Interesting. I usually have stuff plugged into all 4 ports. However I did have a DaVinci Resolve Studio activation thumbdrive in on of those ports. I recently found out that all of those thumbs have been deemed null as of the new update. I recently removed it and uninstalled the old version of Resolve . I will keep my keyboard plugged in and let you know how the computer run over the next week and let you know my findings! thanks for this tip!
[doublepost=1552187485][/doublepost]

Hi sdshannon!
Thanks for the reply,

I have not changed the CPU as yet, but I updated to the 129.0.0.0 BootRom:

Model Name: Mac Pro
Model Identifier: MacPro6,1
Processor Name: 10-Core Intel Xeon E5
Processor Speed: 3 GHz
Number of Processors: 1
Total Number of Cores: 10
L2 Cache (per Core): 256 KB
L3 Cache: 25 MB
Memory: 32 GB
Boot ROM Version: 129.0.0.0.0
SMC Version (system): 2.20f18
Illumination Version: 1.4a6
Serial Number (system): F5KNM0CG****

The bootloader update has not made a difference, but of note having devices plugged into to these two USB3 ports (picture) drastically reduces the frequency with which it will boot without video! Think this may point to an issue with the I/O board.... thoughts??

I also just got a external enclose for my 970 Pro... I'm hoping I don't have to relegate it to an external SSD and can put it back into my Mac Pro! hopefully we can solve this issue! lol

 

[RxJemm]

I foolishly stripped one of the screws for the logic board .. for some reason it is screwed in SO tight. So the CPU replacement will have to wait until I can get that figured out..

Otherwise, I threw in my 960 EVO M.2 and installed ESXi on it. Runs flawlessly, but still exhibits the random no video issue on some boots.

 

[sdshannon]

I foolishly stripped one of the screws for the logic board .. for some reason it is screwed in SO tight. So the CPU replacement will have to wait until I can get that figured out..

Otherwise, I threw in my 960 EVO M.2 and installed ESXi on it. Runs flawlessly, but still exhibits the random no video issue on some boots.

oh that's rough! are you running a USB hub by chance?

 

[BayouTiger]

I was having a similar issue with random reboots. I had upgraded from 6 to 12 core. Turned out to be a bad board. I was also having Nd ram slot not show. Been rock solid since replacing.

 

[RxJemm]

I was having a similar issue with random reboots. I had upgraded from 6 to 12 core. Turned out to be a bad board. I was also having Nd ram slot not show. Been rock solid since replacing.

Hi, was it the circular logic board you replaced?
[doublepost=1552402834][/doublepost]

oh that's rough! are you running a USB hub by chance?

Nope, just a few devices plugged in : Webcam, external drive, power for desktop speakers.

 

[sdshannon]

interesting. I have a theory about my Mac Pro using a hub, which could be similar to the I/O theory you have. Ill let you know in a few days the conclusion I have come to!

 

[BayouTiger]

Hi, was it the circular logic board you replaced?
[doublepost=1552402834][/doublepost]

Nope, just a few devices plugged in : Webcam, external drive, power for desktop speakers.

No, it was the larger board with the RAM slots.

 

[sdshannon]

Hi, was it the circular logic board you replaced?
[doublepost=1552402834][/doublepost]

Nope, just a few devices plugged in : Webcam, external drive, power for desktop speakers.

so finally the machine gave up. it would power cycle repeatedly. I brought it in to the apple store. They sent it out... turns out that my B- GPU was bad. I just got her back today. Ill let you know how it goes.

 

[RxJemm]

I am sorry to hear that ! If that were to happen to me, it would be too expensive a fix to be personally worth it

 

[sdshannon]

I am sorry to hear that ! If that were to happen to me, it would be too expensive a fix to be personally worth it

so...the saga continues. Mac Pro did it again today. Turned it self off. Upon starting up it took two attempts to get it to turn back on. So I guess the issue hasn't been fixed . Back to the shop again.

 

[RxJemm]

Well I got around to finally getting that logic board screw loose (Dremel and a steady hand heh), and changed the cpu back to the stock 3.7 Ghz quad core part. Things were getting from bad to worse, as I had random freezes on watching youtube, and VLC.

- also found some corrosion on the power leads to the GPUs and I/O board (the ones with the silver screws).

So far so good!! (knock on wood)