Welcome to the forum, Tom. Make sure your hdmi cable is plugged in your camera securely (I assume you are using a gimbal and not the hard mount that came with Solo). Also make sure your model camera is checked from the list of cameras in the app. You could also check your hdmi under the battery tray to make sure the ends are securely plugged in. Those are the fixes I would check. Maybe other members can chime in with any other ideas. Good luck, and fly safe.