mostdef

Hi I just installed a new Swann DVR4 Securanet DVR with 3 Swann Cameras, all hardwired. When I plug a monitor into the back of the DVR i can see all 3 cameras working with no issues but when I try and view the cameras over the local network using the supplied PC Viewer D6 Series software I cannot see the cameras at all. I can login to the dvr system with no issues and see the settings for each camera but get no visual pictures on the screen. I'm not plannin on using it on the internet as yet but have also tried this and again can login but get no visual on the cameras. this seems to be the only issue. Any ideas? Cheers