The displayed video is not full in the monitor.
Please do the following:
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Check your physical connections from the system to the monitor.
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Check your aspect ratio.
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If a VGA connection, ensure the screws are tight.
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For the VGA connection, 25 feet or less is recommended for high resolution and 50 feet for lower resolution.
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If a DVI connection, also ensure the screws are tight.
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For the DVI connection, Up to 15 feet at high resolutions (above 1280x1024), or up to 50 feet at lower resolutions (1280x1024 and below)
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If a HDMI connection, 1080p monitor is recommended.
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For the HDMI connection, less than 50 feet is highly recommended with 25 feet or less is preferred.
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If a DP connection, make sure the monitor is at least 1080p.
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On the monitor check the current resolution setup. If the current setup is 19201080, then you need to set the monitor resolution as 19201080 or 1080P capable.
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Monitor is incapable of displaying the device recorders resolution output.
Coaxial with BNC connector
HDMI (High-Definition Multimedia Interface) Connector
DVI (Digital Visual Interface) Connector
DP (Display Port) Connector
VGA (Video Graphics Array) Connector