Hi, I am a complete n00b when it comes to this. I believe I have isolated the problem to be a power supply issue. None of my cameras IR are turning on. Cameras worked fine and then randomly turned off. System has ran fine for years. All cameras are off and I have a red question mark on my DVR. DVR HDD has been tested and works. I am assuming there is either a loose connection somehow or a power supply issue. I have a separate power supply box - the LED on the cover is flashing red and if I open the cover the lights flash green. I have not tested the fuses. I am assuming the next step is to do that and then remove each camera one by one from the supply. Any help or advice is appreciated!