If the light is not on or flashing, then it is getting no power from the SkyView network. Do you have a network cable plugged into one of the D9 ports on the back of the control panel (not just the D15)?
You can't adjust squelch until SkyView is talking to it, so it's not that unusual it would be breaking squelch right now. There's no way to adjust the radio squelch from the control panel.