Naomi Johnson

I connected my Nightowl Video recorder DVR-HDA-10LB-81-RS and it worked perfectly for 4 days. On the 5th day, my video screen that has the cameras (4) listed all show video loss with the date & time stamp still showing at the top of the screen. I did a troubleshooting with the company (Nightowl) and the tech said i probably needed a new cord connecting all the cameras. I brought a new cord and connected it. But having the same problem. Its not the cord. What can it be??