iMac Won't Boot After Power Failure

Discussion in 'iMac' started by sle39lvr, Oct 22, 2013.

  1. sle39lvr, Oct 22, 2013
    Last edited: Oct 22, 2013

    sle39lvr macrumors newbie

    Joined:
    Nov 29, 2009
    #1
    I have a 2009 27" i5 iMac.

    For few months now, there was a significant delay after I press the power button to machine to power up.

    Few weeks ago, I had a power outage and aftwards it woud not turn on. Things I tried:

    - Resetting SMC
    - Leaving it unplugged from the wall
    - Leaving it unplugged from back of the machine
    - Holding down the Power button while plugged in
    - Holding down the Power button while unpugged
    - Leaving it unplugged with RAM out


    About an hour after, it mysteriously powered up.

    Yesterday, I had another power outage. This time I tried the same things, but did not power up for about 6 hours.

    Today, I had to unplug it after shutting down to switch power outlets and now it won't boot again. So I have to wait for it to mysteriously do it's own thing.

    Every time after it powers up, it works without any issues.

    What can cause this? Could it be a bad PRAM battery?
     
  2. old-wiz macrumors G3

    Joined:
    Mar 26, 2008
    Location:
    West Suburban Boston Ma
    #2
    well..first I would suggest you get a UPS.

    do you have "restart after power failure" checked? I think it's best if it is off.

    If you don't have a UPS/surge protector when the power comes back on it sometimes comes on as a surge, and can damage your machine.
     
  3. sle39lvr thread starter macrumors newbie

    Joined:
    Nov 29, 2009
    #3
    I had it on.

    Can anyone tell me if this could be the PRAM battery?
     
  4. sle39lvr thread starter macrumors newbie

    Joined:
    Nov 29, 2009
    #4
    Machine haven't booted for the day. It has been over 12 hours now and this is the 3rd time that this happened. :confused:
     
  5. sle39lvr thread starter macrumors newbie

    Joined:
    Nov 29, 2009
    #5
    Took it to Apple store. I am getting charged $105 for power supply replacement. It could be more if logic boards need replacements afterwards.
     
  6. bp1000 macrumors 65816

    Joined:
    Jul 7, 2011
    #6
    It would seem logical to suggest the PSU went but surprised it blew, the surge must have been significant. I wouldn't recommend a surge projection extension socket.

    It likely did its job of protecting the other components. Hope it gets fixed soon.
     

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