The video capture card isn't showing an image in OBS.

[Icccs]

I use OBS for multi-camera broadcasts connected via a video capture card, but now the capture card's image isn't showing up—just a black screen. I’ve tried most troubleshooting steps, like deleting and re-adding the source, but nothing worked. I even uninstalled OBS and reinstalled older versions, yet the problem persists. I don't know what else to do.