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  1. #1


    Member Since
    Jul 05, 2007
    Location
    Los Angeles
    Posts
    70
    Specs:
    iMac (Retina 5K, 27-inch, Late 2014), 32 GB Ram, 27" Thunderbolt Display, 4TB G-RAID TB Storage
    My iMac keeps going to sleep on it's own...WHY?!
    I've tried researching this in the past to no avail. I can't seem to figure out the specifics of what triggers this, but it continues to happen. My computer goes to sleep while I'm working and will continue to do so after I wake it up. It seems to happen when I'm in Photoshop, making a detailed selection with my Lasso tool. The other thing that I thought was contributing to the scenario is that I seem to always have something streaming in the background when it happens.

    I don't think it's a key combo, though I'm usually holding Option and Command. I wondered if it might be the computer overheating and deciding to take a nap, so I put an external fan on the back, not sure if that helps (sometimes). I'll usually stop the streaming and it will continue if I go back to PS, however it will sometimes help. If I stay out of PS it seems to stop, so I feel like PS is part of it but why I don't know.

    Does anyone else have this or a similar problem? My computer and set up details are:
    iMac (Retina 5K, 27-inch, Late 2014), 32 GB Ram, 27" Thunderbolt Display, 4TB G-RAID TB Storage

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    55,432
    Specs:
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    Unhook everthing.... The TB display and the RAID storage. Then if possible, open Photoshop and do whatever you can to see if the machine goes to sleep by itself. I suspect (and I might be wrong) that either the new to you TB display is causing it or maybe the RAID storage. (unlikely)

    Your machine is too new to have overheating problems, besides that won't cause sleep. Overheating usually causes a complete shutdown or reboot. Let me know.

    If all of that doesn't have an effect, try doing a SMC reset to see if that stops the sudden sleepiness.

  3. #3


    Member Since
    Jul 05, 2007
    Location
    Los Angeles
    Posts
    70
    Specs:
    iMac (Retina 5K, 27-inch, Late 2014), 32 GB Ram, 27" Thunderbolt Display, 4TB G-RAID TB Storage
    Yes, I think seeing if it still happens with nothing connected would be a good start, to see if it's one of these things. That said, it's not specifically this TB display since it was happening with my other Cinema Display as well. This has been happening to my computer for a long time now.

    I'll look into the SMC reset as well, thanks.

  4. #4

    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, USA
    Posts
    4,158
    Specs:
    L2014 Mac mini macOS 10.13, iPhone 8+ iOS 11, iPad Pro 1 12.9" iOS 11,  Pencil 1
    Look in System Preferences > Mission Control. Select the Hot Corners button, in the drop down that opens, do you have "Put display to sleep", or something that may affect the Screen Saver?
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  5. #5


    Member Since
    Jul 05, 2007
    Location
    Los Angeles
    Posts
    70
    Specs:
    iMac (Retina 5K, 27-inch, Late 2014), 32 GB Ram, 27" Thunderbolt Display, 4TB G-RAID TB Storage
    Thanks for the suggestion ferrarr. No, I don't have anything selected for any of the Hot Corners.

  6. #6

    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, USA
    Posts
    4,158
    Specs:
    L2014 Mac mini macOS 10.13, iPhone 8+ iOS 11, iPad Pro 1 12.9" iOS 11,  Pencil 1
    Have you done the SMC reset? How about an NVRAM reset, https://support.apple.com/en-us/HT204063?
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

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