[Help!] Mac Pro 5,1 with GTX 680 and LED Cinema Display black screen

Discussion in 'Mac Pro' started by VelNZ, Nov 7, 2016.

  1. VelNZ macrumors newbie

    May 21, 2010
    Hey all,

    I've got a Leadtek GTX 680 4GB (bought off eBay) in my Mac Pro 5,1 that I've been using to power 2x 23" Apple Cinema Displays (the older aluminum ones). One plugs into the DVI port of the graphics card and the other goes through a DVI->HDMI adapter into the graphics card, no issues here, works great. The only other port on the graphics card is a Displayport.

    After Apple's departure from the display business (oh god why), I decided to upgrade to the last displays that will work with my Mac Pro: the 27" LED Cinema Displays (Mini Displayport). I bought one and it works great with my 2013 Macbook Air through the Thunderbolt port so I know the display works. I then purchased a Mini Displayport (F) -> Displayport (M) adaptor (this one: https://www.amazon.com/StarTech-com-DP2MDPMF6IN-DisplayPort-Video-Adapter/dp/B003N3DTKY) but when I plug the display into the graphics card using it nothing happens. Rebooting does nothing, switching to the OS X display driver from the web driver does nothing. I have no idea how to fix it!

    I've also tried connecting the monitor as so: Graphics card HDMI (F) <- HDMI cable (M/M) <- Displayport (M) to HDMI (F) adaptor <- Displayport (F) to Displayport (F) adaptor <- Mini Displayport (F) to Displayport adaptor (M)<- Cinema display 27" Mini Displayport cable (M). This also doesn't work even though it's using the HDMI port of the graphics card which works.

    Any ideas?
  2. -VoiceOfReason- macrumors member

    Apr 27, 2010
    Are you sure it's a Mini DisplayPort Cinema Display and not the Thunderbolt one?
  3. VelNZ thread starter macrumors newbie

    May 21, 2010
    Yeah, it has 3 USB ports on the back and a USB 2.0 plug with Magsafe1 and Mini Displayport.
  4. h9826790, Nov 8, 2016
    Last edited: Nov 8, 2016

    h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    The Thunderbolt Display's cables, port, whatever.... looks identical to the Cinema Display. However, the monitor itself won't work with any display port, it only works with the Thunderbolt port on a Mac. That means the cMP has no way to drive it, no matter which GPU / adaptor you have. (If you wrongly buy the Thunderbolt Display as the Cinema Display)

    Update 1: I made a mistake, the Thunderbolt Display has firewire port which the Cinema Display doesn't have. So, it's actually easy to tell if it's a Cinema Display by checking the ports at the back.
  5. bax2003 macrumors 6502a


    Dec 25, 2011
    If monitor has just 3 port usb hub and usb at the compuer side it is 100% LED Cinema Display.

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