iMac Keeps Waking up for no apparent reason!

Discussion in 'iMac' started by Mork, Feb 2, 2010.

  1. Mork macrumors 6502

    Joined:
    Jan 9, 2009
    #1
    We have a new iMac, but for some reason, it comes out of sleep all by itself. In the middle of the night, the monitor comes on, then goes off, then comes back on later, ....

    The only program running (according to Command-Tab) is Finder.

    Any reason why this could be happening and what we can do to fix it (keep the mac asleep)?

    Thanks in advance for any help or suggestions.

    - M
     
  2. Hellhammer Moderator

    Hellhammer

    Staff Member

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    Dec 10, 2008
    Location:
    Finland
    #2
    Check your Energy Saving settings and repair your permissions with Disk Utility. If it still continues, restart it and don't open any apps but put it to sleep and see if it wakes up (this is to eliminate possibility of software glitch/bug)
     
  3. Mork thread starter macrumors 6502

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    Jan 9, 2009
    #3
    Thanks for your reply.

    What in particular about the energy saver settings would cause this?

    Thanks.
     
  4. Hellhammer Moderator

    Hellhammer

    Staff Member

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    Finland
    #4
    Wake up in network connection or from preset options (bottom right corner) if you have set it to wake up at certain time.

    Sorry if my setting names aren't the same as I'm using OS X in Finnish.
     
  5. bobob macrumors 68030

    bobob

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    Jan 11, 2008
  6. Mork thread starter macrumors 6502

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    Jan 9, 2009
    #6
    Thanks!

    Disk utility didn't seem to find anything, but I did a reboot and will wait and see. Thanks.
     
  7. Mork thread starter macrumors 6502

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    Jan 9, 2009
    #7
    New Problem

    Actually,

    now we can't get the iMac to go to sleep at all.

    Click the apple, click sleep.

    The display flashes (like it "wants" to go to sleep), but then comes right back on.

    Could this be a hardware problem?

    This is a brand new machine. Time to call Apple?

    -- M
     
  8. dsnort macrumors 68000

    dsnort

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    #8
    I'd call Apple. If the machine is new the support will be free, and I've always found them to be extremely helpful.
     
  9. Hellhammer Moderator

    Hellhammer

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    #9
    I agree with dsnort. It's not your job to solve problems. Call Apple and get it fixed
     
  10. Mork thread starter macrumors 6502

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    Jan 9, 2009
    #10
    Thanks.

    A quick Google search shows that this is a common problem, with no, as I saw, definitive solution.

    :(

    - M
     
  11. Fishrrman macrumors G3

    Joined:
    Feb 20, 2009
    #11
    "A quick Google search shows that this is a common problem, with no, as I saw, definitive solution."

    There IS a "definitive solution". One that will work, 100% guaranteed.

    Here's what to do:
    1. Hook the iMac up to a power strip or surge protector with an on/off switch.
    2. At night, don't put the iMac "to sleep". Instead, choose to "shut down".
    3. When the iMac goes dark, reach down and flip the switch on the power strip to OFF.
    4. In the morning, reach down and flip the power strip ON, then press the iMac's power-on button.

    Do this, and you will NEVER be bothered by the iMac "waking up" in the middle of the night. 100% certainty.
     
  12. Mork thread starter macrumors 6502

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    #12
    Very funny. :)
     
  13. Fishrrman macrumors G3

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    Feb 20, 2009
    #13
    "Very funny"

    Wasn't intended to be "funny".

    I was serious. That's exactly what I do with both my Macs.
     
  14. talmy macrumors 601

    talmy

    Joined:
    Oct 26, 2009
    Location:
    Oregon
    #14
    I had a problem with my new iMac constantly waking up from sleep. It turned out to be a bot trying to hack into my SSH port I keep open for remote access. I'd suggest disconnecting the network connection and seeing if the computer starts sleeping. If so, there is network activity waking it up.

    I closed the port and now it sleeps like a baby.
     
  15. WilliamG macrumors 604

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    Mar 29, 2008
    Location:
    Seattle
    #15
    Yeah this sounds like a software issue. Next, try reinstall of OS.
     
  16. greg400 macrumors 6502

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    Aug 13, 2009
    #16
    I'm incredibly surprised no has told him to look at Console logs.
     
  17. Mork thread starter macrumors 6502

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    Jan 9, 2009
    #17
    The solution for us turned out to be just unplugging the USB cable that goes to an old HP 6 LaserJet printer.

    Even though the printer was OFF, as soon as I unplugged the USB cable from the back of the iMac, it went right to sleep.

    Weird, but fixed.
     
  18. Hellhammer Moderator

    Hellhammer

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    #18
    If it's old, the driver is probably not made for Snow Leopard (you have it right?) so that's causing it.
     
  19. Mork thread starter macrumors 6502

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    #19
    It's a brand new iMac, OS/X version 10.6.2.

    - M
     
  20. SaSaSushi macrumors 68040

    SaSaSushi

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    Location:
    Takamatsu, Japan
    #20
    Glad to hear you tracked it down to the older printer.

    I've noticed that any USB activity whatsoever will wake up a Mac. That is to say that if I put my iMac to sleep and then notice I forgot to power off my Canon MP960 printer, just hitting the power button on the printer to shut it off will instantly wake up the iMac. It's not limited to USB either. I use the SPDIF out via mini-TOSLINK cable to connect the Mac to a home theater and turning the receiver off and on will wake the machine.
     
  21. SaSaSushi macrumors 68040

    SaSaSushi

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    Takamatsu, Japan
    #22
    He was referring to the printer (and thus its drivers) in case that's what you meant. :p

    You can check and see if HP has any updated drivers for it.
     
  22. Mork thread starter macrumors 6502

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    Jan 9, 2009
    #23
    I'm not sure then what the point is of having "new HP drivers" in 10.6.2 then... ????
     
  23. SaSaSushi macrumors 68040

    SaSaSushi

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    Aug 8, 2007
    Location:
    Takamatsu, Japan
    #24
    Was that mentioned? I did have a look at HP's site. Is yours the 6P?

    They do indeed claim SL drivers come with the OS.

    You've absolutely confirmed the printer to be the cause of your Mac's sleep disturbances so I suppose you could either just leave it disconnected while sleeping or contact HP for support.
     
  24. Mork thread starter macrumors 6502

    Joined:
    Jan 9, 2009
    #25
    Thanks.

    Yes, with the printer cable plugged into the USB port going to the apple menu and selecting sleep looked like it would initially put the computer into sleep, but then it snapped right back on. The screen saver would kick in and based on the power settings it would sleep, but then come on intermittently during the day/night.

    Unplugged the cable to the printer (even when it's off) and viola. iMac goes right to sleep and stays asleep.

    Strange for sure.

    -- M
     

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