3 monitors on a Radeon hd 5770

Alright so I have been running two monitors on my 5770 perfectly fine for about half a year. (they are both 22inch lg monitors). For christmas I got a 42 inch vizio smart tv and wanted to hook it up to my computer and run 3 monitors. (I am using the hdmi and dvi ports for the lg and wanted to use the display port for the tv). I got a male to male display port to hdmi cable and when I hook it up to my computer and go to the screen resolution settings in windows 7 it recognizes it. When I attempt to display something though it doesnt work (I just want to mirror monitor one or extend the screen). Do I need to set something up on my card or can my computer even support this? As always thanks for the help.

 

Malarky32

 

 

is your tv input set correctly? it should work with 3 monitors. try swapping the monitor to the displayport with an adapter. your tv might not be able to input the signal from the displayport. (likely some sort of DRM issue)

One of the problems is that when I click apply on the screen resolution settings to choose how I want it to be displayed it wont let me save the settings.