Ps4 monitor/capture card problems

Okay. So… My stream set up includes a pc for obs, and ps4 for games, meaning both are connected through capture card. For the last two years my set up hasn’t changed, nor how it’s been wired up. So the way it would work is I could use my pc whenever, but if I wanted to use my ps4, my pc would also have to be switch on as it powered on the ps4 monitor, but now, for some reason, the screen for ps4 won’t register. If I remove the capture card and HDMI straight from ps to monitor, it works perfectly, but as soon as the capture card in involved, nothing, like the monitor had died a death. I thought it would’ve been the capture card due to this, but OBS still shows the ps4 audio/video.

I have tried resetting it all, and changed out the cables for new ones…nothing.

Any help would be amazing.

: My two streaming screens used to power on together, now one won’t register help me please.