Mac Pro won't startup blinking power light

Discussion in 'Mac Pro' started by albehany, Dec 11, 2012.

  1. albehany macrumors newbie

    Joined:
    Dec 11, 2012
    #1
    Howdy folk,

    got the delivery of new 16GB of Ram apple ram
    http://store.apple.com/us/memorymodel/ME_MACPRO_S10_RAM
    this week, and have finally got the time to pop the side of my 8-core and try to install.
    Processor 2 x 2.4 GHz Quad-Core Intel Xeon
    MAC PRO Mid 2010
    i add the 16gig to the default 6 gig i should have 22 gig
    However! When I do, and re-power the mac all I get is a flashing power light (pretty sure that means a RAM issue).
    Note:
    if i remove the 2X8 gig mac pro work
    and if i remove the old 1X6 gig ram Mac Pro work
    but if i but thin toghter lashing power light and no work
    I was under the impression I could run different sized and speed modules of ram :mad:
     
  2. Macsonic macrumors 65816

    Macsonic

    Joined:
    Sep 6, 2009
    Location:
    Earth
    #2
    This also happened to me before. Found out one of the ram sticks was defective that causes the blinking start up light. Upon replacing the defective ram with a new one, the Mac Pro worked fine.
     
  3. DanielCoffey macrumors 65816

    DanielCoffey

    Joined:
    Nov 15, 2010
    Location:
    Edinburgh, UK
    #3
    How have you got the ram arranged in the slots? Tell us what About This Mac - More Info - Memory shows you.
     

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