If the camera is online and can Listen, Audio, PTZ control, but can’t display the real-time video, then it must be cause by hardware problems. The solutions are as follows: 1. Reset it to factory default settings, re-configure it and try again. 2. Upgrade the camera to latest firmware. 3. Run the camera in other client, such as PC client, Phone client, Web client, if all operations failed, then it must be hardware problem. 4. If none of the above methods work, then please contact the dealer for replacement or maintenance.