Mac Pro 2008 Won't turn on

Discussion in 'Mac Pro' started by cbt3, Oct 25, 2012.

  1. cbt3 macrumors member

    Dec 14, 2011
    So I have a Mac Pro 3,1 it has been off for several weeks since I upgraded to a newer system, and I was keeping around as a backup, also it has several HDDs in it. I went to turn it on today and to my dismay, when I hit the power button, I hear a click come from the power supply, the usual noise, and then a few seconds later it clicks off. I cannot find anything online about this,

    the only thing I could fine was here

    which let me to try to reset the SMC here

    which did nothing, I had already done those steps and tried different cables. I am totally at a loss here, and Apple Car expired on this machine over a year ago, does anyone know whats going on?
  2. Mactrunk macrumors regular

    May 12, 2005
    Hard to diagnose from afar.
    I had a similar problem, but in my case it seemed to be temperature related.
    I replaced the power supply and all is well.
  3. cbt3 thread starter macrumors member

    Dec 14, 2011
    I was thinking it was the power supply, but how do you replace the powersupply on a Mac Pro?, it seems built into the chassis?
  4. cbt3 thread starter macrumors member

    Dec 14, 2011
    And I am looking online, $300 for a powersupply? that seems a bit pricey!
    Is it possible it could be the battery in the motherboard? I really can't think of anything else to do to troubleshoot this, like what other diagnosis steps could I try? It just flat out is not turning on?
  5. phpmaven macrumors 68040


    Jun 12, 2009
    San Clemente, CA USA
    I would suspect a failed HDD or a card that needs to be reseated. I would take it out side and blow all the dust out and then pull out any PCI cards and reseat them. Also pull out all of the HDDs and try to just boot off a CD.

    It's amazing how many non-booting PCs I brought back to life just by pulling cards out and reseating them, or even just pressing down on components on the motherboard.

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