27" imac and 23" Cinema Display not waking

Discussion in 'iMac' started by bodtwo, Oct 17, 2014.

  1. bodtwo macrumors newbie

    Joined:
    May 24, 2011
    #1
    Hi all,

    I've a late 2011 27" imac with an aluminium 23" Cinema Display that's been running fine up until I installed 10.9.5. Since then the external display is not coming back on after the screens have gone to sleep.

    The only way I can get it to work is to pull the power cable from the Cinema Display, plug it back in and when I do that the imac recognises it and it works.

    I've tried a PRAM and SMC reset but the problem persists, I've even installed Yosemite but I get the same issue.

    Any ideas?

    Thanks all.
     
  2. bodtwo thread starter macrumors newbie

    Joined:
    May 24, 2011
  3. eduardrw macrumors 6502

    Joined:
    May 20, 2013
    #3
    Won't help you debugging your problem but:
    I run a 27' late 2009 iMac with 30" Cinema display - no problems with wake ups at all.
    Maybe time for a clean install.
     

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