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  1. #1

    Member Since
    Nov 06, 2016
    Screen 'blacks' out randomly.
    Recently my iMac late 2009, has developed a rather annoying problem. When using it the screen just goes to sleep - sometimes before I can add my log-in details then on other times I can use it for an 1hr, 2hr or longer before this happens.

    When the Mac's screen goes to black I can "screen share" from my other Mac and everything works fine.

    Can anyone shed any light on the problem or give me advice on how to solve.

    Thanks in advance.

  2. #2

    ferrarr's Avatar
    Member Since
    May 21, 2012
    Pawtucket, RI, USA
    L2014 Mac mini macOS 10.13, iPhone 8+ iOS 11, iPad Pro 1 12.9" iOS 11,  Pencil 1
    I don't know if it will help, but could you provide full system specs and Mac OS X/OS X/macOS version of your iMac?

    It sounds like there is an issue in the display, and that it is not lighting up. Others have mentioned, shining a flashlight onto the screen, to see if anything is being displayed? It could be a connection, the backlight or something back there?

    Have you tried to run Apple Diagnostics,
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  3. #3

    lclev's Avatar
    Member Since
    Jul 24, 2013
    Ohio (USA)
    2017 13" MBPro, 2013 13" MBAir, 2010 MacPro, iPhone X
    You could give the suggestions in this article I found:

    Post back and let us know if it helped.

    Recommend using Onyx to clean your Mac.
    If you have been helped, please add to their reputation by clicking on the icon in the lower left hand corner of the post.

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