Mac Pro won't startup blinking power light

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

  1. albehany macrumors newbie


    Dec 11, 2012
    Howdy folk,

    got the delivery of new 16GB of Ram apple 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).
    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


    Sep 6, 2009
    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


    Nov 15, 2010
    Edinburgh, UK
    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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