SOLVED
So the mini HDMI cable was very loose. I used some jewelry pliers to crimp the male connector and made a tighter connection, now It works!
A friend gave me this GH4 a while ago. I got it working using the mini HDMI out on the camera and this capture cardand through a powered USB hub (also tested through direct to PC). Now after refiguring my setup, I had to disconnect my camera from my setup for a few minutes to move things around. However everything was turned off before disconnecting. I plugged everything back in, and now my source on streamlabs displays my capture card as just a black screen. It registers that it is connected, but there is nothing going through. could it be a setting in the GH4 that got reset, the HDMI port on my GH4 is faulty, could it be the capture card? I’m at a loss and I am very distressed over this. Is there anyone out there who can help me?
I am gonna go out on a limb here and say that your gh4 has had some settings reset. Your capture card just pushes what it receives. If you do get a blackscreen that means the capture card doesn’t get any data. Otherwise your capture card would say no signal or alike.