* 1. Please use monitor to test, DO NOT use VNC.(Customer Feedback: During the VNC it spend some of gpu and there is not enough for camera.)
* 2.First the HDMI device should be plugged in and have signal output before the Raspberry Pi is started.* 3.Please check if there is a video related file in the /dev file.
* 4. Please provide us more details for us to confirm the issue.
a. First please send us your '''order number''' and tell us "Call command" "Input Device" and "Using Device".