Mac Pro Won't Power On!

Discussion in 'Mac Pro' started by highdefw, Jun 21, 2011.

  1. macrumors 6502

    Joined:
    Apr 19, 2009
    #1
    Thanks for the help everyone. I've been using my 2009 2.26 octo MP since January. Suddenly today it powered off. To be specific, I had a 7-port USB hub connected via usb to the MP. When I plugged in the AC adapter to fully power the hub, the Mac Pro turned off!!!

    I unplugged everything and tried resetting the SMC, no go. The power LED startup light doesnt even come on. If I hit the DIAG LED button on the backboard, a yellow bulb lights up next to "SV STBY", nothing else. Anyone know what that means?

    I am not under warranty. Is there anything I can do to figure out the problem? Could it be the PSU or backboard?

    Thanks
     
  2. macrumors regular

    Joined:
    Jan 10, 2009
    #2
    Really could be anything just take it into apple they can see whats wrong with it i believe. and they should give you a quote before they charge you anything
    Im not sure you should check first
     
  3. macrumors 65816

    odinsride

    Joined:
    Apr 11, 2007
  4. macrumors regular

    Joined:
    Dec 13, 2010
    Location:
    CT, USA
    #4
    Disconnect the front panel board (the board with the power button, front USB, exc) and then try jumping SYS_PWR solder pads on the motherboard. If it starts than it is most likely a bad front panel board. If not I can provide farther troubleshooting info.
     
  5. thread starter macrumors 6502

    Joined:
    Apr 19, 2009
    #5
  6. thread starter macrumors 6502

    Joined:
    Apr 19, 2009
    #6
    Looking around, but where is the SYS_PWR solder pad on the board? And what's the best way to jump them?
     
  7. macrumors 65816

    odinsride

    Joined:
    Apr 11, 2007
    #7
    Reason I asked is because I had the same issue using a cheap monoprice hub. Does your system boot with the hub and all USB devices (other than mouse/kb) unplugged?
     
  8. macrumors 65816

    odinsride

    Joined:
    Apr 11, 2007
    #8
    Not sure where the SYS_PWR is but you can jump it by putting touching both leads at the same time with a metal screwdriver. Be careful and make sure you're jumping the right leads.
     
  9. macrumors 6502a

    Tucom

    Joined:
    Jul 29, 2006
    #9
    The PSU for that USB hub in the OPs URL looks like the same that Monoprice uses for nearly everything that I've bought from them, however I've never, ever been disappointed with MonoPrices quality, but I'd imagine that would be a similar if not same hub MonoPrice at least WOULD sell, and thus use the same PSU AC power adapter which in theory could be causing the same issue that odinsride had.
     
  10. thread starter macrumors 6502

    Joined:
    Apr 19, 2009
    #10
    Haven't tried booting it with the hub attached... scared to even dare try that... It looks like it only shorted out the front panel board, so I'm having that replaced. Hopefully it's nothing more. The backboard plane and PSU seem to be ok...
     

Share This Page