Cinema Display 20" - seems to work with 2 rather than 3 cables attached

Discussion in 'Mac Accessories' started by katewes, Jun 30, 2015.

  1. katewes, Jun 30, 2015
    Last edited: Jun 30, 2015

    katewes macrumors 6502

    Joined:
    Jun 7, 2007
    #1
    The Apple 20" matte, silver-frame Cinema Display has three cables: a DVI cable, Firewire and USB.

    According to the Apple instructions, all three need to be connected to the MacBook Pro's ports.

    I used a DVI-to-MiniDisplay Port to connect the first DVI cable to the MBP's Mini-Display Port.

    I connected the USB.

    However, I did not connect the Firewire cable (because I didn't have a Firewire converter).

    And yet, the Cinema Display seems to work fine with just 2 out of the 3 cables connected.

    Why does Apple require all 3 cables to be connected, and am I potentially causing problems to the hardware? Or I am good to go with just 2 cables connected?
     
  2. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #2
    You only plug the usb and FireWire in if you want to use the port replicator on the back of the display.
     
  3. katewes thread starter macrumors 6502

    Joined:
    Jun 7, 2007
    #3
    Thanks. So if I want the port-replicator, do I need to connect both the USB and Firewire, or will just one of those suffice?
     
  4. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #4
    USB will enable the USB ports and FireWire will enable the FireWire ports
     
  5. katewes thread starter macrumors 6502

    Joined:
    Jun 7, 2007
    #5
    Thanks. That makes so much logical sense. It's a pity that the Apple instruction manual did not explain that so clearly. The manual just said plug it in, without explaining what would be the result of plugging in the various cables.
     
  6. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #6
    That's what forums are for. To ask simple questions and get a simple answer back.
     
  7. katewes thread starter macrumors 6502

    Joined:
    Jun 7, 2007
    #7
    Gav2K, you wouldn't happen to know if two such Cinema Displays -- with DVI cable -- can be attached to a mid-2012 MacBook Pro?
     

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