I walked into the lounge on Tuesday and there was a buzzing noise coming from around the TV area but I couldn't determine where it was coming from. I switched my CCTV on and the 4 cameras were displayed on the monitor. my wife said the buzzing sound was coming the CCTV DVR so I switched it off and the buzzing stopped, I switched the CCTV back on but it didn't come on and whereas there was 2 lights showing on the front of the DVR, there is now only the PWR light on it and it doesn't turn on any more. I have checked the monitor and all the cables and everything is fine. Do any of you brainy A.B'ers have any bright ideas what could be wrong with it PLEASE?