No video output on the monitor/TV? (NVR)
If there's no video output on the monitor from NVR, try the following:
Ensure the lowest resolution of the TV/monitor Is no less than 1080p, or It won't be able to display any video from the NVR.
Ensure the power supply of your NVR is working. Please notice the status of Power LED.
Ensure the HDMI/VGA cables and TV/monitor you used are working properly, we suggest trying a different cable or monitor to test.