No output from Second Zone (was working a week ago) on Denon 3805. Zone is connected to a Niles audio SI-275 amp. The amp turns on when it detects a signal (it does not turn on now). My mother-in-law went crazy with my universal remote when I was away and I have no idea what she did. I assume she changed some setting. Does anyone know the proper AVR settings to turn on the zone? I believe the cables are OK

I appreciate any help.