I just hooked up two camera to my dvr which is KKMOON 8CH Channel dvr which I bought on ebay. It is powered with a 12 volt adapter with multiple adapters for up to 8 cameras. Camera 1 which still works, (Waterproof IP66 700TVL IR Night Vision CCTV Camera, and camera two is a dome camera which is not working. Led's are still on # 2, but camera is not showing up on screen. I checked connections and they seem fine. I watched the footage of the camera that died, and right before it went off the picture got distorted and turned to black screen. Camera that broke was over a year old. The odd part of my problem is that the dome camera died right after I hooked it up to power supply. As in two for one power supply. The only other thing I could mention is that, the camera that died had an extra long cable, maybe 50-75 feet, and other camera's cable was only 25 feet. What are anyone's suggestions, as to what might of caused problem?