iMac randomly suts down...

Discussion in 'Mac Pro' started by imacintel, Jun 7, 2006.

  1. imacintel macrumors 68000

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    Mar 12, 2006
    #1
    I was doing stuff on my iMac and it just blanked. Completely shut down. My power was fine, the power did not black out. It was very weird. It would not start again, for about an hour. What could of gone wrong?:confused:
     
  2. mad jew Moderator emeritus

    mad jew

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    #2
    What stuff were you doing? What's plugged in to the iMac? Could the power cable have accidentally been kicked out of the power socket? :)
     
  3. lamina macrumors 68000

    lamina

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    From Canada, living in Seoul
    #3
    It may possibly have a problem with a temperature sensor. Install the iStat widget into dashboard and see if the temperature numbers are giving anything.

    If it happens again I'd call AppleCare.
     
  4. Johnny Rico macrumors 6502

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  5. mad jew Moderator emeritus

    mad jew

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    #5
    I'm guessing it's an Intel iMac. :p

    As for the heat thing, that's a good point. However, if that's the case, it would have been sleeping and not shut down. Was there a pulse light?
     
  6. benthewraith macrumors 68040

    benthewraith

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    Miami, FL
    #6
    I've known computers to shut down when overheating. :rolleyes:

    It could have been anything. See if it happens again.
     
  7. mad jew Moderator emeritus

    mad jew

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    #7

    Macs will almost always fall asleep before they crash from overheating. :)
     
  8. benthewraith macrumors 68040

    benthewraith

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    #8
    That's good. :)
     
  9. Nar1117 macrumors 6502

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    Apr 15, 2006
    #9
    I've never heard of any computer Sutting down. ;)

    Couldn't resist...
     
  10. imacintel thread starter macrumors 68000

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    Mar 12, 2006
    #10
    Answer:ALL

    Ok.

    I was only doing light surfing in Safari. CoreDuoTemp and Temperature Monitor both report about 38C(hard drive, CPU). My power cord was as tight as possible. Both ends. Any ideas? Could it be an earlier problem I had with the Power Management/SMC chip?
     
  11. mad jew Moderator emeritus

    mad jew

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    #11
    Well it's very likely it's an SMU issue. What were your earlier problems? Was the power supply replaced? :)
     
  12. imacintel thread starter macrumors 68000

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    Mar 12, 2006
    #12

    It has not done it again, and no the power supply was not replaced. I did not even take it to Apple.
     
  13. imacintel thread starter macrumors 68000

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    Mar 12, 2006
    #13
    I did have earlier problems that could be with the SMU(buzzing from earphone jacks).
     
  14. Lazze macrumors newbie

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    May 5, 2006
    Location:
    Esbjerg, Denmark
    #14
    This sounds like what's happening to my iMac G5. I had the PSU replaced, I had the logicboard replaced, but it's still shutting down. I talked to one of Apple's technicians today and he told me they had recieved a bad batch of PSU's, and that might be the problem. I'll probably know more in a few days when I get a visit from Apple - to, once again, replace the PSU.

    Lazze
     
  15. kevin.rivers macrumors 6502a

    kevin.rivers

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    Dec 4, 2005
    #15
    I have to call B.S. on this one.
     
  16. mad jew Moderator emeritus

    mad jew

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    #16

    How did it get fixed? If you're continually having issues that could be based around the power supply, then I'd take it in to Apple and ask for a replacement. A bad power supply can potentially (although not usually) wreck a lot of other components on your machine so it's something that should probably be sorted out. If it's fine at the moment, then let it be, but if it plays up again I'd take it straight back to Apple. :)



    When a Mac reaches a certain temperature (obviously different for each line) in a certain component it falls asleep. In most cases this means the heat source is switched off such that the Mac stops getting hotter, eventually cooling down. The PMU or SMU (depending on your Mac) will not let you wake the machine again until it has fallen below a certain temperature threshold again. Therefore, unless you're in the very rare circumstance of having a Mac that continues to heat up through the sleep process (weird because only the RAM and parts of the logic board are powered), it won't shut down. :)
     
  17. imacintel thread starter macrumors 68000

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    Mar 12, 2006
    #17
    Ok. Thanks. I will look in to taking it into my mac store. when will apple expand their stores in to can?
     
  18. mad jew Moderator emeritus

    mad jew

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  19. imacintel thread starter macrumors 68000

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    #19
    and prettyy much verywhere else excpt USA:D
     

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