I had this problem with my 06 S model (only one screen). I had installed a pac II into my sat port so I could have an aux port. When I re-assembled I didn’t get the harness clipped all the way in. If your radio says no DVD most likely it’s unplugged from the deck. You’ll have to take the dash apart, and pull the head unit to check. There are directions in the forum on how to do this.