Did you maybe mix up the Title and Body sections of that post? I don't think your full thought is in that post. You have 3 monitors and you want to add a 4th that's a UHD 50"? All on a single GeForce GTX 970?
Okay. Let me be more clear. I have three Asus vx238's monitors working fine side by side. I want this TV VIZIO P502ui-B1E 50 To be my fourth "monitor" over top of all these mounted on the wall but I can not even get it to connect to the Vizio tv at all.. All my monitors are running through display ports. I was trying to get the tv to go through the lone hdmi port on the graphics card. (Geforce 970).
Also often when I plug the HDMI plug into the graphics card the other monitors will go black screen.
Four is kind of tough... can you see all four of them in the nVidia control panel when they are plugged in? I can't imagine that your display card would disable either HDMIs or DPs if the other was in use, but we can check that too. Which card, specifically, are you using?