just got my n-3 and hook all wiring up. got power and everything but no sound. check wiring again but no sound I have a 2004 nissan maxima with bose, also another thing when I insert dvd i'm getting the do not enter symbol. any help will be greatly appreciated.

Did you hook up the amp turnon wire and the amp ground wires?

You have to get used to the way the DVD function works. When you put your DVD in hit the touch screen button in the lower left hand portion of the screen (it's a right arrow type button). Push that until you get the arrows that take up the right portion of the screen. With those arrows and that enter button you can navigate through the DVD menu.