mac pro and projector. dvi works. mini display doesnt?

Discussion in 'Mac Pro' started by nunes013, Jul 16, 2011.

  1. nunes013, Jul 16, 2011
    Last edited: Jul 16, 2011

    nunes013 macrumors 65816

    nunes013

    Joined:
    May 24, 2010
    Location:
    Connecticut
    #1
    At my school I am a student sound/lighting technician. We have a mac pro that has two mini display ports and a dvi port. We use a video switcher that has a dvi in and out that sends the video to our projector. Today we are running a slideshow for our music camp but we have a problem. Our video switcher for some reason doesnt like mini display port. When we send a dvi signal from mac pro>mini display to dvi adaptor>dvi cable>video switcher we dont get a signal. When we send it mac pro dvi out>dvi cable> to video switcher it works. We use the dvi out for our monitor so we are trying to use the mini display for our projector. Also, we used a macbook pro to send the same signal, macbook pro>mini display to dvi adaptor>dvi cable> video switcher and it doesnt see the signal.

    so basically, when we use a mini display to dvi adaptor it doesnt get a signal but when we use just a dvi out it works. the computers dont recognize the projector when we use mini display either. any ideas.


    EDIT: could this because we need a dual link adaptor.
     
  2. TheAnalogue macrumors member

    TheAnalogue

    Joined:
    May 12, 2011
    Location:
    Clearwater, Fl
    #2
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    Needing a dual link DVI seems the most likely to me
     
  3. CaptainChunk macrumors 68020

    CaptainChunk

    Joined:
    Apr 16, 2008
    Location:
    Phoenix, AZ
    #3
    You technically only need the dual-link adapter if you're driving resolutions above 1920x1200 (which is doubtful for most projectors).

    But I have seen strange cases where the dual-link adapters work where the single-link ones do not, in similar circumstances. I suppose you could give it a try and see how it works.
     
  4. nunes013 thread starter macrumors 65816

    nunes013

    Joined:
    May 24, 2010
    Location:
    Connecticut
    #4
    our projector is a christie and it is used in a good size concert hall so i wouldnt doubt the resolution might be up there. i am going to check and try it with my friend who is another student tech friday and we will see what happens. will post update.
     
  5. iBookG4user macrumors 604

    iBookG4user

    Joined:
    Jun 27, 2006
    Location:
    Seattle, WA
    #5
    Try an active mini-displayport to DVI adapter like the one here. See if using that fixes things.
     
  6. nunes013 thread starter macrumors 65816

    nunes013

    Joined:
    May 24, 2010
    Location:
    Connecticut
    #6
    the dual link cable worked. we think it worked over the regular adaptor because the dvi cable going to our projector is 60 ft long and the regular adaptor couldn't push the signal that far or something while supporting such a high resolution. anyway thanks!!!!! we just ordered one for $50 new on ebay.
     

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