Hello! I am in a motel where manager has installed parking lot video cameras--but nothing appears on screen. I asked if it was correctly grounded and he said it has 4 wires and all is attached correctly with no fuses or relays--nothing appears on viewing screen in his office. Is there a coupler or other device that could fail for all cameras to send nothing to monitor? I realize this is scant information to provide you with. Any help at all would be greatly appreciated. Thank you in advance for it!
