Mac Pro 5.1 Shutting down issue

Discussion in 'Mac Pro' started by kasuja00, Aug 1, 2018.

  1. kasuja00 macrumors member

    Joined:
    Jun 3, 2018
    Location:
    Italy
    #1
    Hi,

    My Mac Pro has a big problem: it shutting down after a few minutes i turn it on.

    It is a 5.1 mid 2012 version, with a Samsung SSD 850 evo on OWC accelsior S. GPU is the flashed EVGA GTX 780 in slot 1.

    Yesterday when i turn it on it shutting down after 1, 2 minutes. I cleaned the ram contact and i boot the Apple Hardware Test disc and i run "Perform extended testing".
    After 1 hour the test was passed ok.

    But after the test i run Geekbench, and after 2-3 minutes it shut down.

    What can it be? Have you got any suggestion? Thank you very much.
     
  2. Razzerman macrumors 6502

    Joined:
    Sep 11, 2007
    #2
    Hello there,

    I would start by taking ram out, leaving minimal amount in. But it sounds like it's shutting down as a safety precaution - check the Northbridge rivet. Plenty of threads on this forum about that.

    Cheers,

    Razzerman
     
  3. yuzgen macrumors member

    yuzgen

    Joined:
    Jul 26, 2018
    #3
    Heat issue. Download MacsFanControl and run Geekbench. Keep an eye on temps and take a few screenshots.
     
  4. AlexMaximus macrumors 6502a

    AlexMaximus

    Joined:
    Aug 15, 2006
    Location:
    A400M Base
    #4
    Geekbench is very hard on your SSD. With certain SSD's it is advisable to restrict Geekbench to an absolute minimum.
    I read that somewhere, this might be important. I would do this short list to make sure the SSD is at its max performance.

    #1 See if Samsung has a new Firmware Update for the 850 Evo. If Yes, - Upgrade the Firmware
    #2 Make a TimeCapsule Backup ASAP
    #3 Reformat SSD and do a new install with MacOS
    #4 Install Trim Enabler
    #5 Check the Power draw on the GTX 780, an EVGA Power Link bracket might be advisable to balance power draw between both 6 + 6 or 6 + 8 pin for that GPU, depending which config you have.

    That's what I would do
     
  5. Auggie macrumors 6502

    Auggie

    Joined:
    Jan 21, 2017
    #5
    I had a similar problem and did all the troubleshooting steps imaginable but still the shut downs.

    Brought it to Apple and they replaced the backplane card, mobo, video card, CPU tray, CPUs, and Airport card, but it didn’t resolve and gave me back the machine with all those brand new parts still installed and refunded all costs.

    MacPartsOnine wanted a chance to fix it and he replaced the PSU and voila: problem solved.

    I’m not saying your problems are caused by the exact same problem as mine, but I would tend to think it may be your PSU...
     
  6. kasuja00 thread starter macrumors member

    Joined:
    Jun 3, 2018
    Location:
    Italy
    #6
    Hi,

    Thank you, i posted an image of the temperatures when i run Geekbench. I run it with a minimal amount of ram (2 x 8 GB)
    IMG_0971.jpg
    Temperatures seems to be normal.
    I booted from a normal hard disk and the Mac Pro has passed all the tests Geekbench CPU and compute Metal GPU.

    Which SSD shoud i buy instead of Samsung 850?

    The 780 GTX was powered by 2x 6pin -> 8 pin plus 2x sata to 6 pin. Now for the test i powered it with 1x 6 pin and 1x 6 pin -> 8 pin. I Think i'll try Powerlink.
     

    Attached Files:

  7. h9826790 macrumors G5

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #7
    You have to run stress test if you want it know the situation is PSU / power related.

    If you have GB3 paid version, there is a stress test for CPU. Or, there quite a few others free benchmarks / CPU stress test available, you can even use the YES command in terminal to do it.

    ON TOP OF THAT, running Furmark GPU stress AT THE SAME TIME. Let it run at least 15min. Then you will know if that’s power related.

    N.B. Do that with your normal config (e.g. back to dual mini 6pin to single 8)
     
  8. kasuja00 thread starter macrumors member

    Joined:
    Jun 3, 2018
    Location:
    Italy
    #8
    This morning I turned on the Mac Pro and in the computer room the air conditioning was switched off. I think there is also the low voltage in my house.
    The machine turns off immediately after logging in. 3 times i tried to run it, but after 1 or 2 minutes it shoutdown.
     
  9. yuzgen macrumors member

    yuzgen

    Joined:
    Jul 26, 2018
    #9
    PSU should regulate the voltage. Boot into a live Linux distro if you can. No issues while doing AHT but shutdown in MacOS makes me think something is wrong with the OS. You can also try to install MacOS again, if you have a spare drive, just for testing.

    Your GPU uses a small amount of power when idle, but a lot when active. If you have another GPU, swap and test please.

     
  10. Auggie macrumors 6502

    Auggie

    Joined:
    Jan 21, 2017
    #10
    Well, when I had similar problems, it would pass AHT just fine with no errors reported with PSU. Apple got the same clean bill of health with their diagnostic tools in regards to PSU so that’s why they never suspected it and never replaced it.

    This goes to show that these diagnostic tools are not always accurate and can’t detect absolutely everything that could possibly be faulty in a computer system.
     
  11. verdejt, Aug 4, 2018
    Last edited: Aug 4, 2018

    verdejt macrumors 6502

    verdejt

    Joined:
    Jul 19, 2011
    Location:
    Central Florida
    #11
    I would start by removing everything but 1 drive to boot from including any optical drives you have. Lowest RAM config you can have and if you have one handy another video card. Preferably one that is basic as you can get, like a stock low end GPU. If you have anything plugged into the USB ports other than a mouse and keyboard I would unplug them as well. See if your machine comes up ok and stays running. Also I would get a UPS Battery backup one with a display on it that shows you incoming voltage and such. It will level out your power and ensure a steady voltage, it will also show you what voltage is being input to it from your house. If it still fails then I would suspect your PSU is bad. Also I would load something like this program https://sourceforge.net/projects/hwsensors/. This will not only show you temps but also voltage from the PSU. It sounds like you have something that is shutting down the PSU. It could be the PSU itself or the video card. I would suspect something that draws a lot of power. Here is a link to the repair manual for your MacPro. http://tim.id.au/laptops/apple/macpro/macpro_mid2010.pdf. In the manual it gives you step by step on troubleshooting this very issue. It's a lengthy procedure but hopefully will lead you to the culprit.
     
  12. pl1984 macrumors 68020

    Joined:
    Oct 31, 2017
    #12
    I've never been a fan of AHT. I had a laptop with a known issue and it passed 24 hours worth of AHT diagnosis. It may catch the basics but I wouldn't rely on it.
     
  13. verdejt macrumors 6502

    verdejt

    Joined:
    Jul 19, 2011
    Location:
    Central Florida
    #13
    I had a 2010 iMac 27 that passed AHT all day but the video card was failing and never caught it. I would just follow the steps in the service manual I posted and start from there. Be patient and methodical and don't skip any steps. Personally I suspect the video card or many the backplane board as going bad. Sounds like you are losing one of the voltages and my bet is on the 5v.
     
  14. kasuja00 thread starter macrumors member

    Joined:
    Jun 3, 2018
    Location:
    Italy
    #14
    Update: I tried to power the GTX 780 with the Evga Powerlink without success. And a few days ago i replace my Gpu with a flashed GTX 680. During Heaven benchmark the Mac Pro turn off.
    I don't know if it is a coincidence, but when the temperature in the room was less than 27 degrees (celsius) my Mac Pro seems work regulary.
    With istat the voltage are regulary, but now i think i should try to replace PSU... What do you think?
    Thank you.
     
  15. AlexMaximus macrumors 6502a

    AlexMaximus

    Joined:
    Aug 15, 2006
    Location:
    A400M Base
    #15
    Sorry to hear that. To me it really sounds like your PSU is dying. With Electronics it is sometimes tricky compared to mechanical issues. Often there are electrical parts that experience a rather slow death over time. Capacitors and resistors can change their electrical value and go through a kind of aging process. Once that happens, symptoms like yours occurs. Inside the PSU are multiple stages for all kind of voltages, so one stage might go bad or can't stand a full load once graphic power draws more energy. I have seen posts here on macrumors recently that experience the same issues with advice where to get a new PSU. It should not be too expensive. Good luck to you
     
  16. kasuja00 thread starter macrumors member

    Joined:
    Jun 3, 2018
    Location:
    Italy
    #16
    Hi,
    now i'm waiting for new (refurbished) PSU, so i hope to solve the problem.
    If i read in Terminal the shutdown cause it tells me: cause = 0 Power disconnected.
     
  17. MacGuy'ver Suspended

    Joined:
    Sep 18, 2018
    #17
    Yes, most likely your PSU is dying!
    44-45C is too hot when your not doing anything that stresses your Mac.
    btw 37c Ambient is very high too....possible there is a lot of dust inside your PSU.
    But from experience a PSU that runs 44/45c , on idle, will not recover from cleaning.

    Buying a used PSU mostly guarantees you get one that also reads too hot, so check that you can return it!

    PS, I test a PSU on cold boot with standard Ambient, like 20-28c...a healthy PSU should read 25/25c after cold boot.
     
  18. h9826790 macrumors G5

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #18
    I live in hot Asia, my computer temperatures may be more closer to OP's. With 34C ambient (very dust free, clean cMP), The PSU roughly run at 42C.

    So, if his ambient it 37C, then 45C idle is very normal indeed. Of course, he can spin up the fan to cool down the PSU a bit.

    For GPU temperature vs life span, this is a good thread to study.

    https://forums.macrumors.com/thread...when-using-pc-non-efi-graphics-cards.1946672/
     
  19. kasuja00 thread starter macrumors member

    Joined:
    Jun 3, 2018
    Location:
    Italy
    #19
    Hi!
    On sunday I replaced the PSU of my Mac Pro. It is very simple.
    Now the computer has been running for 3 days and i hope i solved the problem.
    I would have 2 questions to ask you:

    Where is the relay that you hear when you turn off the computer?
    I noticed a strange thing happening before i replaced the PSU: when I regularly turned off the computer the led located on the ethernet switch (Dlink) sometimes turned off, sometimes not, is it normal?
    Thank you very much for the advice.
     
  20. tsialex macrumors 601

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #20
    The relay is on the PSU.
     

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19 August 1, 2018