I'm a general IT guy that's handy in a few areas.
One of my clients has a bunch of cameras that go through an American Dynamics MegaSwitch LT and then onto some DVRs. They have a CC300 keyboard to control the output on three monitors.
They called me in because the monitors were all dead. The DVRs still saw the cameras fine. I found a blown fuse in the Mega Switch and replaced it. The monitors have video now, but while the MegaSwitch powers up the keyboard, it seems to be ignoring any commands I issue. It never displays a menu. Would anyone be able to lend some advice as to what to look for or try next?