Solution: Connect another working cable to the target camera and channel, if it is working, it is the cable's problem. If you find one or some of your cameras have no image, Please swap cable, camera, and channel port to confirm it is the camera or cable, or port's problem. Solution: Connect the adapter to the camera directly without a 1-4 split cable to have a try. If you can see infrared lights turn on with red lights, cameras are on.
Solution: You can also use your hands to cover the front part of the camera. Solution: Check if you connect the system correctly. There are some causes leading to that situation, you can try the below steps to get some help. If all cameras are connected to DVR/NVR with cables and the recorder is connected to a monitor with a cable, one or several cameras show no live video on monitor, but others are working fine.
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