If the video recorder's resolution is set to high for the monitor to handle, the monitor will not display any output. To resolve this, set the resolution lower. For example, for a 720p monitor, the video recorder's resolution must be set to 1280x720 or lower. To do this, locate the SHIFT key on the front panel of the recorder. Power off the unit completely. Hold the SHIFT key in, power on the recorder and continue to hold the SHIFT key until the unit boots on (beeps). The unit will reset to the lowest resolution available. Go into the Main Menu > Setting > Display menu to change the resolution that the monitor can support.
Some units do not have a SHIFT key on the front panel, but instead use an Up Arrow (hollow) key.
If the unit does not have either a SHIFT or Up Arrow (hollow) key, then connect a monitor that supports the resolution the recorder is currently set to. If this is not feasible, please contact DH Vision technical support.