Well, the navigation worked for two weeks but now it doesn't work at all. The 7500 works fine (radio, DVD's, etc.), but when I power on the navi, the main Pioneer screen loads up (although it's a bit fuzzy/jumpy), and then I just get bars. I tried a format through the service menu but it didn't help. What can possibly be wrong?

How very sad, no one wants to even try to help. Now a poor person like me has to spend his bill money by shipping it out to Pioneer.