Why does do my screens occasionally go off then back on?

Discussion in 'MacBook Pro' started by oxband, May 6, 2012.

  1. oxband macrumors 6502

    Sep 10, 2009
    Occasionally, when I'm connected to my external monitor and doing dual screen, both screens go off and back on. It takes a second. Everything resumes as normal. But it's disconcerting. I havent been keeping a log, but it doesnt seem to happen with any regularity. Just at random times.

    Any thoughts?
  2. chipchen macrumors 6502

    Oct 30, 2002
    More than likely it's your computer thinking there's a change in the monitor setup (removing or adding a monitor). I assume it looks like if you just plug your monitor into your computer and it goes out for a second while it adds the second.

    Check your cables, make sure they're tight. If you're using an adapter, maybe you need to get a new one.
  3. oxband thread starter macrumors 6502

    Sep 10, 2009
    so it isnt necessarily a sign of a big problem? it doesnt bother me. im just worried maybe it's a sign of something larger.
  4. Interstella5555 macrumors 603


    Jun 30, 2008
    This is totally normal, the external display needs to detect the input, and the computer needs to detect the output.

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