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HOW TO DISABLE VIDEO LOST BEEP
 

This beeping sound is caused by unplugged cameras. You can deactivate the unused ports by following these few steps.

1) Click on Configure --> Camera/ Audio Install --> Camera/ Audio Install Disable unused ports in cameras and audio by clicking Activate button. Then, hit OK.
Uncheck the camera input that does not have a camera plugged in

2) Or, click on Configure --> Video Signal Diagnostic --> check on Disable Video Lost Beep

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