I had same problem I know you might need to recode amp if you install but I had same problem and I replaced amp and now music is fine but nav screen is still blank. I think my nav drive might be dead because i also tried making a v28 cd but mine doesn't do anything after I put it in...it doesn't eject itself. The fact that your drive is ejecting it's v28 disc tells me the drive is good but maybe the "nav brain" is bad. What file did you use and what "brain" does it have?