I just purchased the Amcrest nv4108e NVR to replace my dead Samsung sde-4001. I want to use the Samsung cams (sbe1005R) that are already mounted/run throughout the house. Will these work with this NVR? I connected them to back of my 4108E, but no joy. I believe this is because the Samsung dvr itself provided power for each camera since I had a separate power supply labeled camera power. Do I need a POE injector or POE switch. I really like this NVR, and don't want to buy more cameras.