Hello everyone, I just purchased a couple of sensormatics RV-2216 multiplexers (I only needed one but the price seemed reasonable so i purchased 2) to replace one which had stopped working on an old system I have. The problem i'm having is that the internal alarm on the units will not turn off, and the units will not even show an image on the screen. This is the problem I originally had on the original unit. I have a basic setup, of still cameras going into the multiplexer and a monitor and vcr hooked up to it. I was wondering if anyone had any idea what might be causing this. Thanks.