Pioneer AVIC-N2 Car DVD Player "wont work 07" Questions

...wont show picture I have the doubble din 7inc touch screen#uv8020. Iv just installed it in a 07 pontiac grand prix. everthing works reads cd and mp3s but when I put a dvd in a black screen appears ...

wont hold on AVIC-N2 I just installed a Pioneer AVIC-N2 in my 07 Altima, and I cant get the memory to hold. everytime the car turns off, or the unit turns off, all my presets are gone. I had the power