Temperamental Mac Pro: Will start; then won't start; then will start etc...

Discussion in 'Mac Pro' started by atlanticza, Jun 9, 2011.

  1. atlanticza macrumors 6502a

    atlanticza

    Joined:
    Jul 18, 2008
    Location:
    Cape Town
    #1
    I tried to switch it on this morning. Nothing. No noise. No fan and no power light. It's as if this Mac is not connected to a power source at all. But try to start it up a number of hours later, it works as if nothing had happened.

    This bizarre behaviour has happened a number of times now over the past week. (And I have reset the SMC but to no avail.)

    It can't be the PSU.

    I'd appreciate any ideas.
     
  2. odinsride macrumors 65816

    odinsride

    Joined:
    Apr 11, 2007
    #2
    Have you tried unplugging all usb and peripheral devices other than mouse and keyboard? Had a similar issue with my mac pro and narrowed it down to the monoprice usb hub I was using.
     
  3. atlanticza thread starter macrumors 6502a

    atlanticza

    Joined:
    Jul 18, 2008
    Location:
    Cape Town
    #3
    Yes, I went through that procedure when resetting the SMC. No difference, alas. (Maybe it's not an early riser!):mad:
     
  4. shardey macrumors 6502a

    shardey

    Joined:
    Jan 28, 2010
    Location:
    Colorado
    #4
    Have you tried a new power cable?

    Have you tried switching outlets?

    What happens if you leave your computer on where it doesn't turn off, let's say for 3 days?
     
  5. Darth.Titan macrumors 68030

    Darth.Titan

    Joined:
    Oct 31, 2007
    Location:
    Austin, TX
    #5
    Out of curiosity, how have you determined that it can't be the PSU? That's exactly what it sounds like to me.
     
  6. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #6
    It's certainly suspect from the described behavior.
     
  7. atlanticza thread starter macrumors 6502a

    atlanticza

    Joined:
    Jul 18, 2008
    Location:
    Cape Town
    #7
    Maybe I'm being ignorant, but I assumed that once the PSU is "blown", it stays that way.
     
  8. atlanticza thread starter macrumors 6502a

    atlanticza

    Joined:
    Jul 18, 2008
    Location:
    Cape Town
    #8
    I have a number of devices working off the same outlet, and they are fine. As for leaving it on, there has been one occasion where it would not wake up from sleep mode - just remained somnambulant so I held the power button down until it switched off.
     
  9. erictooth macrumors newbie

    Joined:
    May 20, 2010
    #9
    Agreed, I think it's very likely the PSU.
     
  10. gnasher729 macrumors P6

    gnasher729

    Joined:
    Nov 25, 2005
    #10
    My nephew had the same problem with a PC. Turned out to be the power button on the front of the computer. Try setting System Preferences so it turns itself on say 8am every morning.
     

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