#1. Check the Connection Between Cameras and the DVR
Step 1. Verify whether the DVR has been connected to the cameras properly. For specific steps, please refer to this FAQ.
Step 2. Log in to the system on the monitor, then go to Main Menu -> System -> General to change the video standard.
Note: If the new setting is still not working, then change the setting back.
#2. Check If the Camera Is On
Step 1. Put the camera in a relatively dim place to check if the camera is on. Solid flashing infrared lights mean the camera is on. If the camera is off, unplug the camera and plug it again.
Step 2. If all cameras are not on, then please:
2.2 Verify whether the camera's power adapter is faulty, by connecting the camera to the adapter of the DVR with one camera directly, without the 1/4 splitter cable.
Step 3. Go to Main Menu -> Advanced -> Restore to factory reset the system.
Step 4. Go to Main Menu -> System -> Digital -> Channel Type. Make sure the first option is ticked.
Note: 1. For more details about how to tell if the camera is on, please refer to this FAQ.
2. If the problem is not fixed, please contact email@example.com to get remote help.