Not quite the same NVR - but these posts should help :Ok so where I need connect the ttl adaptor on nvr main board
Make sure that the video is set to "auto connect". I had same problem when I changed video connection setting before allowing "auto connect". took about 3 minutes and 2 reboots (on both ends-NVR, monitor).Hi device have new software but status is the problem with connection to the TV by HDMI port and VGA port is black screen when nvr is power on is one beep sometimes black screen but sometimes start screen is freeze up and I can't du anything . The system can't boot properly everything freez up .