Can i have my Connex Prosight screen in my fatshark dominator V2? 
There is no image everytime i try plugging in the HDMI. Also when i turn off the inside rx in the dominator it doesnt work

First you need to turn off the VRX receiver, Theres a switch on the bottom of your goggles for external Receiver.

You try to hook hdmi first then power goggle. Also I believe if connex is outputting 50hz it won't work.
If my computer of outputting 50hz refresh rate my goggles won't work with hdmi until I turn it to 60hz. I could have that backwards so it's either 50 or 60hz

Same thing with Dji inspire. If your computer is connected to the hdmi it will work. But the goggles nope. Has to be Dom Hd or HD V2 at least.

Connex specifically states the dom v2 is not supported. Dom HDv1 and HDv2 are, as well as Dom v3.