I have a 2000 maxima with bose. The HU was starting to act up a little so I bought a used HU from a fellow orger who took it out of his 2000 I30. Everything was plug and play except I had to change the trim around b/c it was slightly different, but when all plugged in and everything, the screen will not show up. They guy I bought it from said it worked perfectly when he shipped it. Is there a problem with the HU or is there a slight difference in something b/c its not the same car? Any info on this would help. Thanks