Why does my iMac wake by itself?

Discussion in 'iMac' started by Neeper, Dec 12, 2007.

  1. Neeper macrumors newbie

    Joined:
    Aug 16, 2007
    Location:
    Calgary, AB, Canada
    #1
    I always put my iMac to sleep when I done using it. But every time I come back into the room and turn the light on, it wakes up. I tried looking around for info but couldn't find anything. Does the mac have a motion sensor? It's annoying because I have to put it back to sleep every time.
     
  2. GSMiller macrumors 68000

    GSMiller

    Joined:
    Dec 2, 2006
    Location:
    Kentucky
    #2
    Sometimes at night when I'm asleep and I have my iMac on but my display asleep it will come on, dunno why. Which iMac do you have?
     
  3. Makosuke macrumors 603

    Joined:
    Aug 15, 2001
    Location:
    The Cool Part of CA, USA
    #3
    It turns on just as you flip the switch?

    Do you have a UPS? I know that my UPS has a tendency to read the "blip" caused by turning on fluorescent lights as a power interruption and kick in for a second. Some (all?) UPSes send a "wake" signal over the USB connection any time they goes to battery power, which will in turn wake the attached computer.

    That's what happens in my house, anyway. If you don't have a UPS, no idea--maybe you have fluorescent lights and they're causing enough of a power twitch to cause some other connected USB device to maybe flicker off for a fraction of a second, which would wake the computer?
     
  4. xUKHCx Administrator emeritus

    xUKHCx

    Joined:
    Jan 15, 2006
    Location:
    The Kop
    #4
    Happens when you turn the light on?

    If so perhaps the infra red sensor is causing the iMac to turn on. To test turn off the infra red sensor System Preferences - Security - general - disable infrared receiver.
     
  5. Neeper thread starter macrumors newbie

    Joined:
    Aug 16, 2007
    Location:
    Calgary, AB, Canada
    #5
    yes it turns on when I turn my light on. Ok, I turned the IF sensor off. Thanks for your help. Hope it works.
     
  6. Neeper thread starter macrumors newbie

    Joined:
    Aug 16, 2007
    Location:
    Calgary, AB, Canada
    #6
    Ok, I guess that didn't work. What the hell is causing this???
     
  7. Neeper thread starter macrumors newbie

    Joined:
    Aug 16, 2007
    Location:
    Calgary, AB, Canada
    #7
    I have the new 20".
     
  8. chadrob30 macrumors 6502

    chadrob30

    Joined:
    Nov 13, 2007
    Location:
    In front of my Mac.
    #8
    My wife's mini does this too, but my 20" iMac does not.
     
  9. mag2001 macrumors 6502

    Joined:
    May 24, 2007
    Location:
    San Antonio, TX
    #9
    unplug all usb devices and see what happens, turn bluetooth off also
     
  10. Makosuke macrumors 603

    Joined:
    Aug 15, 2001
    Location:
    The Cool Part of CA, USA
    #10
    I take it no UPS. As mag2001 suggested, first try unplugging all USB (and FW if you have any) except the keyboard, and see if it does it then. If so, try turning off bluetooth (and, heck, airport too) and see what that does. If still no love, and you have a wired network connection, try unplugging THAT too--basically leave nothing plugged in but the keyboard and power.

    If none of that helps, I'm stumped--it's got to be some kind of weird EM interference, but I can't imagine what.

    Also, you didn't say: Is this a fluorescent light, or incandescent?
     
  11. iMan G5 macrumors member

    Joined:
    Oct 10, 2007
    #11
    Your iMac reads you mind. When it notices your thinking of turning on the lights it thinks your going to work on it and it gets ready for you :D Seriously, I bet it is a USB device. My POS Logitech mouse wakes my iMac G5 up all the time.
     
  12. Neeper thread starter macrumors newbie

    Joined:
    Aug 16, 2007
    Location:
    Calgary, AB, Canada
    #12
    You guys were right. It was one of the USB device. I still wonder how it senses me coming in the room though. Thanks for your help!
     

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