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  1. #1
    Mac won't sleep - "Idle sleep preventers: IODisplayWrangler"
    Hi,

    suddenly, my MacBookPro 17", El Capitan, won't fall asleep anymore. Turns down for a few seconds perhaps, but then comes back again.

    Upon "pmset -g assertions" it says: "Idle sleep preventers: IODisplayWrangler"

    I tied a couple of times resetting the SMC, as well as the NVRAM. I reinstalled the OS. I erased the disc, reinstalled the OS, reinstalled the user from backup. Nothing, always the same.

    Which gives me the impression it's a hardware thing, and not a software.

    Any hints? I found only a few posts on this, most of them with a solution (if at all) via the print queue - which can't be the case for me (fresh install OS X)...

  2. #2
    Mac won't sleep - "Idle sleep preventers: IODisplayWrangler"
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    56,338
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, Mojave
    Does your MacBook Pro have the original hard drive installed or have you replaced it? And have you tried booting to safe mode to see if it sleeps?

  3. #3
    No, not the original HD. Have since ~1.5 years a 1 TB SSD.

    And yes, tried it with safe mode as well, but same issue.

  4. #4
    Mac won't sleep - "Idle sleep preventers: IODisplayWrangler"
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    56,338
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, Mojave
    Well, since it won't sleep in safe mode, that sort of eliminates software as the cause. It could be hardware related as you say, especially if it just started doing that. Normally, a SMC reset will get things back to normal but you stated that you had tried that along with a NVRAM reset.

    Do you have a bootable external hard drive that you can use to boot your MBP with? If you do, see if it will sleep when booted that way.

  5. #5
    Mac won't sleep - "Idle sleep preventers: IODisplayWrangler"
    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, US
    Posts
    4,945
    Your Mac's Specs
    L2014 Mac mini macOS Mojave, iPhone 8+ iOS 12, 12.9" iPad Pro 1 iOS 12, Pencil 1
    After you erased the drive, did you do a clean install of an OS? Only the OS, no user files, no additional apps, and it was still doing this?
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  6. #6
    Quote Originally Posted by ferrarr View Post
    After you erased the drive, did you do a clean install of an OS? Only the OS, no user files, no additional apps, and it was still doing this?
    Yes, wiped off everything. Clean install with only OS. User with nothing in it. No apps, nothing. And still the same problem.

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