MacPro 5,1 is not booting anymore

Discussion in 'Mac Pro' started by Coyote2006, Dec 5, 2018.

  1. Coyote2006 macrumors regular

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    Apr 16, 2006
    #1
    Hi, Mac MacPro 5,1 is not booting anymore. It starts and the GPU-Fan seems to run endlessly but the screen stays black. The Mac is not booting. I've already switched RAM but without success. Any ideas what could be wrong?
     
  2. tsialex macrumors 68030

    tsialex

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    #2
    Do you have a Mac EFI GPU to check if it's a hardware or a software problem?
     
  3. Coyote2006 thread starter macrumors regular

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    #3
    I've got the same problem with the Radeon 4870 and a flashed 680.
     
  4. tsialex macrumors 68030

    tsialex

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    #4
    If you don't get the chime and nothing shows on the screen, the next step is to check diagnostics less of the logic board. If EFI led is off, you have a brick.
     
  5. Coyote2006 thread starter macrumors regular

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  6. tsialex macrumors 68030

    tsialex

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    #6
    Like I wrote, you need to check the diagnostics leds on the backplane. If EFI is off, you have three options:

    you have 3 options:
    1. Replace the backplane.
    2. Buy a Mac Pro MATT card.
    3. Desolder, externally reprogram the SPI flash memory, solder again, you can read all the process starting here #929.
     
  7. Coyote2006 thread starter macrumors regular

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    #7
    Thanks a lot tsialex. How do I check the diagnostics leds on the backplane? Sorry, I've never done this.
     
  8. tsialex macrumors 68030

    tsialex

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    #8
    Download the Service Manual for 2010 Mac Pro, there you will find everything to diagnose your Mac Pro.
     
  9. Coyote2006, Dec 5, 2018
    Last edited: Dec 5, 2018

    Coyote2006 thread starter macrumors regular

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  10. tsialex macrumors 68030

    tsialex

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    #10
    Begin with page 33.
     
  11. Coyote2006 thread starter macrumors regular

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  12. tsialex macrumors 68030

    tsialex

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    #12
    Weird, why 5V led is blinking? Can you test your power supply with another Mac Pro?
     
  13. Coyote2006, Dec 5, 2018
    Last edited: Dec 5, 2018

    Coyote2006 thread starter macrumors regular

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    #13
    unfortunately, no
    --- Post Merged, Dec 5, 2018 ---
    You think that this might be related to the PSU?
     
  14. ldfa macrumors newbie

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    Oct 29, 2018
    #14
    Hello
    What I see on the video, it is GPU ok led blinking ! not 5V ....
     
  15. Coyote2006, Dec 5, 2018
    Last edited: Dec 6, 2018

    Coyote2006 thread starter macrumors regular

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    #15
    Thanks ldfa, you seem to be right. Looks like this leads to problems on the processor board.
     
  16. tsialex macrumors 68030

    tsialex

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    #16
    Your Mac Pro have an upgraded the CPU from the Apple original one? It's a single or dual CPU? It's a 4,1>5,1 or a real 5,1?
     
  17. Coyote2006 thread starter macrumors regular

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    #17
    4,1>5,1 (single CPU) and I updated the CPU about 3 years ago. One of the Northbridge rivets was/is not completely upright. Maybe that could cause the problem. I'll try to organise new rivets, clean the CPU and the Northbridge chip and reinstall it. Do you have a sourse for the rivets? I just found some in China and the delivery takes about 2-3 weeks.
     
  18. tsialex macrumors 68030

    tsialex

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    #18
    I know that you can buy the Mac mini CPU heatsink original ones from Digikey, if I remember correctly, but I bought a package of 100 of the generic one from China last year, 60 days to arrive here. The Mac mini ones fit better than the generic ones. I never saw the real Mac Pro ones for sale.
     
  19. Coyote2006 thread starter macrumors regular

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    #19
    Thanks for the info :)
     
  20. Coyote2006 thread starter macrumors regular

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  21. tsialex macrumors 68030

    tsialex

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    #21
    Sorry, I got it from a post on netkas, years ago. Tried to found it now, but didn't succeed.
     
  22. Coyote2006 thread starter macrumors regular

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    #22
    ok, no problem. thanks for your great support!

    I've also found and ordered a processor board on ebay. At least I have a backup board then :)
     
  23. Coyote2006 thread starter macrumors regular

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    #23
    Do you still have one of them? What size do they have?
     
  24. tsialex macrumors 68030

    tsialex

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    #24
    Mini ones, not anymore sold all the minis and the Mac Pros I used them.

    There is a thread here about the rivets.
     
  25. Coyote2006 thread starter macrumors regular

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