MacPro resetting when nudged

Discussion in 'Mac Pro' started by longmover, Oct 9, 2011.

  1. longmover macrumors member

    Joined:
    Apr 24, 2006
    Location:
    Wales, UK
    #1
    I have a rather annoying problem with my 08 MP. If it gets the slightest nudge, even a bump to the desk in which it lives, it resets itself (or sometimes a KP). I've pulled out and reseated all the drives, the RAM and the front and rear fan assembly. I am starting to think it might be perhaps a loose CPU or something gone awry in the PSU. Has anyone else had a similar problem, did you fix it and if so how?

    Cheers!
     
  2. nanofrog macrumors G4

    Joined:
    May 6, 2008
  3. longmover thread starter macrumors member

    Joined:
    Apr 24, 2006
    Location:
    Wales, UK
    #3
    I couldn't see how to get to the PSU and it seemed to be self contained? Any tips?
     
  4. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #4
    Start with the PSU connections that attach to the logic board (CPU power in particular).

    To get to the main PSU connector, pull the Optical Drive carrier (aluminum bracket that holds the optical drive/s).

    Past that, follow the cables backwards from where they connect to the logic board and other devices. IIRC, some are routed behind the front fan assembly and even under the logic board.
     
  5. longmover thread starter macrumors member

    Joined:
    Apr 24, 2006
    Location:
    Wales, UK
    #5
    Thanks mate, will do.
     
  6. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #6
    Hope this is the cause, and it's easily located and fixed.

    Good luck. :)
     
  7. handheldgames macrumors 6502a

    handheldgames

    Joined:
    Apr 4, 2009
    #7
    A ground fault could be causing the same issue... Try disconnecting everything hooked up to your mac pro and hook up what you need to boot. keyboard, mouse, display & power.

    Have you been inside the machine lately?
     
  8. pcmxa macrumors regular

    pcmxa

    Joined:
    Apr 9, 2011
    Location:
    ABQ
    #8
    Can't help with what it might be, but one of the mac pros in our lab does this. We couldn't figure out the issue, so located it on the floor aways away from the desk. I hope you will let us know if you isolate the problem.
     
  9. Neodym macrumors 65816

    Neodym

    Joined:
    Jul 5, 2002
    #9
    My apologies for thinking so trivial, but - you did check that the external power cabling (going to the wall power outlet) is sitting properly in the back of your MacPro, didn't you?! You may even be able to tell by the colour of the connection pins whether the plug may be the culprit...
     
  10. longmover thread starter macrumors member

    Joined:
    Apr 24, 2006
    Location:
    Wales, UK
    #10
    I stripped her down yesterday, took out all the drives, cards memory plus the front fan assembly, checked all the cables/connections (a couple were a bit loose) cleaned and re-assembled. Plugged just the power, keyboard mouse and display in, booted to the drive selection screen (held alt) but still, after a small bump on the desk/case it resets itself. It's truly frustrating, the power connector at the back is seated properly, I'm running out of ideas! Is there any kind of reset button on the motherboard which may have become overly sensitive?

    ----------

    Will do!

    ----------

    I see what you're saying there, I'll power down now and check for any discolouration (although I have flicked the power connector as a test which didn't trigger the reboot...)
     
  11. G4er? macrumors 6502a

    Joined:
    Jan 6, 2009
    Location:
    Temple, TX
    #11
    Maybe Doc Brown built that Mac Pro out of used pinball machine parts. :D
    TILT
     

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