MacPro 4.1 won't boot up, no power

Discussion in 'Mac Pro' started by tfronau, Jun 7, 2012.

  1. tfronau macrumors newbie

    Joined:
    Jun 7, 2012
    #1
    Early 2009 MacPro 4.1Quad 2.93 GHz, 8 GB, 10.6.8
    When I turn it off, it won't boot. No light no power nothing. I have to unplug the computer, remove the cover, reset the switches on the motherboard, plug it back in, and then it will startup. Why? What would cause thiis?
     
  2. highdefw macrumors 6502

    Joined:
    Apr 19, 2009
    #2
    dead power supply? The easiest way to know what's wrong is to take it to Apple.
     
  3. Dr. Stealth macrumors 6502

    Joined:
    Sep 14, 2004
    Location:
    SoCal
    #3
    Check the Battery

    Check the battery. Or just replace it to be sure. It's cheap. It's under your graphics card.

    Could be power supply failing though. :(
     
  4. tfronau thread starter macrumors newbie

    Joined:
    Jun 7, 2012
    #4
    Won't boot, no power unless I reset

    I replaced the battery, no change.

    The power supply seems to work once I push the reset buttons on the motherboard. I don't think it is the ps. Can anyone tell me what the reset buttons on the MB do?
     
  5. tfronau thread starter macrumors newbie

    Joined:
    Jun 7, 2012
    #5
    It was the power switch, but they had to replace the entire case.
     

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