Set up 3rd monitor

Posted on 2012-09-20
Last Modified: 2012-09-21
I want to setup 3 monitors on my Windows 7 machine. Currently I have 2. The 3rd monitor I've now plugged into the HDMI connection of the graphics card (the other 2 monitors are using DVI I think). The 3rd monitor shows up the Control Panel/Display section, but I can't get it to work. (see attached screenshot). What do I need to do?

HP Z600 Workstation
AMD FirePro V5900
Question by:allelopath
    LVL 95

    Assisted Solution

    by:Lee W, MVP
    No direct experience with this, but I've been told that sometimes, graphics cards that have three connections only support TWO active displays.

    I use four monitors using two graphics cards.  In the past, on SOME systems, I've been able to use onboard graphics with a single dual head card to get three monitors working.
    LVL 28

    Accepted Solution

    Most video cards don't support a 3rd monitor.  However you can get one of these.

    It connects to a USB port and they can be a 3rd, 4th, etc. monitor.

    The thing to remember is that the video is going over USB so if you are doing moving video you want to put that on the monitors attached to your video card.

    This works great for low bandwidth graphics such as Power Point, Excel, etc.  Basically displays don't need a high refresh rate.

    On your attached graphic the 3rd monitor would probably become available if you disconnected one of your two DVI connections.

    Or you can add a second video card but that would more more expensive and more work.
    LVL 69

    Assisted Solution

    With the exception of certain nVidia Quadro cards and AMD Eyefinity cards, you can only get two working displays, even though there are more connectors.  The reason for this is because there are only two clocks provided by the hardware.  Your choice is to get one of the cards which support three or more monitors, use two graphics cards, or add a USB video adapter.

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