Hi, I have a Samsung SDH-B74041 DVR camera system. It's been working fine over the past years. Last week, I started seeing just a blue screen with "Samsung" in white letters for each camera pane. I tried shutting the system down and restarting it but that has not done any good. The thing that seems really weird is that the "power" light on the DVR does not illuminate. Can anyone provide any ideas on what this problem may be? Thanks.