I cannot get my third monitor to display.
I have 2 HP 27xw connected on the monitor through the HDMI port and on the video card's miniDisplay ports without an adapter.
I have 1 Samsung SyncMaster SA550 connected through and HDMI cable to the HDMI on the video card.
I can get any combination of 2 monitors to work but never the third using the windows settings. And using the Radeon software I can only get 2 monitors recognized at a time.
I have also tried using a VGA cable on the monitors connected through a DVI adapter. Any combination of cables will allow 2 monitors but never the third to save.
I have a Radeon 7970 graphics card.
What 7970 make and model graphics card are you using?
It can support a maximum of two legacy display connections (HDMI, DVI) and any further displays must be connected to a native DP/mDP connection using DP to DP cable or an Active adapter that will convert the DP signal to a legacy connection (HDMI, DVI). Please refer to this video for a full explanation.