mac pro "thunderbolt to displayport" asus PB278Q issue

Discussion in 'Mac Pro' started by wildwill, Feb 19, 2015.

  1. wildwill macrumors newbie

    Joined:
    Jun 10, 2008
    #1
    Hello all.

    I have a 2014 Mac Pro which I have a 6ft mini displayport to to displayport cable connected to a asus PB278Q. This works fine but I want to move the Mac Pro off my desk and onto a shelf, so got a 15ft mini displayport to to displayport cable and when I connect it up the screen does not see any input on the display port.

    Any ideas?

    Will
     
  2. martinm0 macrumors 6502a

    Joined:
    Feb 27, 2010
    #2
    I'm going to guess the cable is bad?? It seems like displayport cables can run much longer than that length, so I expect it should work. Have you tried plugging it into another Thunderbolt port? Was it a decent quality cable? Might need to return it and get a new one is possible.
     
  3. wildwill thread starter macrumors newbie

    Joined:
    Jun 10, 2008
    #3
    Well funnily enough this is the not my first cable that this has happened with. I ordered a Cable Matters cable from Amazon (link below) and have had the same issue with both. I also tried using a different port on the machine with same result.

    http://www.amazon.com/gp/product/B00C7RL33M/ref=oh_aui_detailpage_o00_s01

    But this evening i just got home with a 3rd cable and this one seems to work ok!

    I think this weekend i will try doing some more testing with the other cables before i return them :)

    On a side note what is the max lenght you have heard working?
     
  4. martinm0 macrumors 6502a

    Joined:
    Feb 27, 2010
    #4
    Great to hear the new cable works.

    I found this info on Datapro.com:

    "DVI offers no audio support; DisplayPort offers full digital audio support (up to eight channels) in the same cable as video. DVI is crippled by its maximum spec length of 5 meters, while DisplayPort is designed for up to 15 meters."
     

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