Mac Pro 4,1 wont boot

Discussion in 'Mac Pro' started by k-philipsen, Apr 14, 2018.

  1. k-philipsen, Apr 14, 2018
    Last edited: Apr 14, 2018

    k-philipsen macrumors newbie

    Joined:
    Apr 8, 2018
    Location:
    Denmark
    #1
    Hi all

    As the title describes my mac Pro wont boot after changing the processors.

    It is a 4,1 EFI flashed to 5,1
    14 gb ram in 7 modules.
    Standard grafics card.
    Booting from a 128 gb ssd in slot 1.
    Standard cpus is two quad core 2,26 GHz
    New cpus is two hex core 3,33 GHz x5680.

    After changing to the lidless x5680, it wont boot.

    I have tried to reseat both cpu several times, only Change is that sometime the fans spin at max rpm, others Very slow/not at all (Dont know)

    I have tried to remove everything, ram, optical drive and the entire cpu tray.

    When it is on and i Press the diagnostic button the 5V STBY led is orange?
    Both cpu leds are OFF.

    The original cpus are tighten all the way Down until the screws cant go any further. I do the same thing to the x5680.

    When i Mount the original cpus it starts as normal, with no problems.

    What am i missing?

    Hope you guys can help me, so i can get i working.
     
  2. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    Sounds like the X5680 are delidded, aren't they?
     
  3. k-philipsen thread starter macrumors newbie

    Joined:
    Apr 8, 2018
    Location:
    Denmark
    #3
    Yes they are. No lids.
     
  4. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    Then do it one by one.

    1) Install CPU A only (the rear one)
    2) Try to boot

    If success, the Mac should boot with full fan speed. Then go to step 4

    If failed

    3) swap another X5680 into CPU A socket any try again.

    If success, the Mac should boot with full fan speed. Then go to step 4

    If failed

    Result 2) Something is wrong. It's hard to believe you have both failed X5680 at the same time. But as long as your socket is fine for the original CPU. I can only assume there is something wrong during the delidded process, and both CPU were damaged. (END)

    4) Install CPU B

    If success

    Result 1) job done! (END)

    If failed

    Result 3) one of the X5680 cause no boot, which means high chance has one CPU damaged. (END)
     
  5. donnyrock macrumors newbie

    Joined:
    Apr 17, 2018
    #5
    Anyone knows what this means. The last line is right before it stop and keeps rebooting itself. IMG_20180416_144516293.jpg
     
  6. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
  7. donnyrock macrumors newbie

    Joined:
    Apr 17, 2018
    #7
    Did all that. Wonder if it could be video card because of those blue lines?
     
  8. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #8
    Those blue lines looks strange to me as well, but a bit hard to believe you get a GPU fail right at the same time.

    Anyway, did you verify both CPUs are good (by only installing one CPU in socket A)?
     
  9. donnyrock macrumors newbie

    Joined:
    Apr 17, 2018
    #9
    No, not yet. Didn't think of that.
     

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