Mac Pro Resurrection

Discussion in 'Mac Pro' started by martinlangley, Mar 14, 2019 at 3:09 PM.

  1. martinlangley macrumors newbie

    Joined:
    Aug 7, 2012
    #1
    Hi I have an ageing Mac Pro A1289 (5.1). When stripped down to the motherboard and (bare) processor card the diagnostics are fine. When the (dual) processor card is populated with a single processor, the front panel light flashes and the startup fails. How do I find the cause of the issue?



    If this is due to a matched pair of processors not being fitted, how does the system know this on the basis of only one processor?
     
  2. tsialex macrumors 68040

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #2
    Dual CPU trays work with just one Xeon if you install the processor into CPU A socket, but the fans will run at full RPM.
     

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