Check Power Indicators
When having problems with security cameras and monitors, the first thing that you should do is to make sure that each camera or monitor that you are having problems with has its power indicator light on. If the light is not on, make sure that the unit is plugged in to a power supply and that it is turned on. If the unit is battery operated, try replacing the batteries and seeing if the power indicator light turns on. If the unit is plugged in but still is not showing power, attempt to plug it into a different outlet or power supply to see if it will power up there. Checking to see if the unit has power is not only one of the quickest ways to solve some problems, but it will also let you know quickly whether your problem lies with a faulty connection or if it is an electrical problem, which will either require you to repair or replace the unit.