Mac Pro 5.1 cant power on

Discussion in 'Mac Pro' started by kaiz, Oct 18, 2018.

  1. kaiz macrumors newbie

    kaiz

    Joined:
    Jun 5, 2013
    #1
    Hello everyone,

    I has been using Mac Pro over 4 years, last night I shut down the Mac before I went to sleep. Next morning as usual I wake up and power on the machine but this time it cannot power on, then I google it and find same symptom like my case https://discussions.apple.com/thread/7569129 .

    I press the power button I can hear a "click" sound but it don't power on, after wait a few sec I press again and hear a "click" again and the machine still off.

    Any help would appreciate. Thank. you.
     
  2. expede macrumors regular

    expede

    Joined:
    Jan 15, 2018
    Location:
    Sweden
    #2
  3. flowrider macrumors 603

    flowrider

    Joined:
    Nov 23, 2012
    #3
    Had a similar issue with my 5,1 cMP last week. The LED on the front panel would light, but no tone and my UPS was reading about a third of the wattage it should be displaying. I replaced the power supply, not an easy task on this machine. It is now up and running.

    Lou
     
  4. startergo macrumors 65816

    startergo

    Joined:
    Sep 20, 2018
    #4
    My mac has similar issues. All I have to do is long press the power button to turn it off. Then a short press will start the mac. It happens to me every time I have to swap cards in the pcie slots or every time the power cord is unplugged. I also suspect the power supply but I don't want to replace it yet. I read somewhere that if you replace the capacitors in the power supply you in practice fix it
     
  5. kaiz thread starter macrumors newbie

    kaiz

    Joined:
    Jun 5, 2013
    #5
    Thanks for everyone reply.

    I tried remove all the PCIe cards and HDDs and replaced a new battery from the motherboard but still no power on. Unfortunately I tried to unscrew the screws that attached to the power supply, one of the screw head is spoiled, what should I do to unscrew the stripped screw :(

    Thank you.
     
  6. MIKX macrumors 6502a

    MIKX

    Joined:
    Dec 16, 2004
    Location:
    Japan
    #6
    The 4,1's are definitely getting older. Two months ago I had to replace my dual processor tray/ / my 4,1>5,1 just shut down while I was using it . . but the replacement tray came with 32gb ECC ram and works perfectly so was worth it.

    The 2012 5,1's will probably still have a few more years left in them.
     
  7. startergo macrumors 65816

    startergo

    Joined:
    Sep 20, 2018
    #7
    You can try this:
    https://www.harborfreight.com/left-hand-drill-bit-set-13-pc-61686.html
    https://www.harborfreight.com/12-piece-screw-remover-and-quick-change-bit-set-95530.html
    https://www.harborfreight.com/screw-extractor-set-12-pc-61981.html
     
  8. chrfr macrumors 604

    Joined:
    Jul 11, 2009
    #8
    I have a bunch of really late 2012 5,1s in service that have had power supply failures with similar symptoms.
     
  9. startergo macrumors 65816

    startergo

    Joined:
    Sep 20, 2018
    #9
    I bought a spare power supply today if it works well I will try to replace the capacitors in the original one and post the results.
     
  10. chrfr macrumors 604

    Joined:
    Jul 11, 2009
    #10
    Interestingly, it's my newest Mac Pros that have the most power supply failures. I've replaced several of the 2012 supplies with parts from 2009 machines.
     
  11. startergo macrumors 65816

    startergo

    Joined:
    Sep 20, 2018
    #11
    Do you know the part numbers?
     

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10 October 18, 2018