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*Check the adaptor of camera whether to see if it is well-connected.
*Check the cable for connecting video input/output in the back panel of DVR.
*Insert the video source directly into the display device and check if they are causing the problem.
*Check the brightness of the picture and bring it back to its original default setting.
*No video input signal or too weak.
*Display settings in the preview set to be closed.
*The hardware of DVR is defective.
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