First, my only repair info for my 2006 SL500 is a crappy WIS Program. Has anyone used the Star System or any other System that is a better maintenance and repair manual?

Second, I had to remove my CD Changer. Everything seemed to go together fine, but now my Nav System doesn't work. When I push the Nav Button I get two messages. The first says, "Navigation being Activated" then after a minute or two I get another message saying, "No DVD available Please insert Navigation DVD"

I have spent a couple of hours researching this and the only thing I saw was a thread where one guy had the same problem and he took his car to the dealer and the tech there said he reset it. But when I asked the guy who posted that message what the tech did he didn't know other than he was told it was reset.

Anyone have a clue on how I can get the Nav System to work again and can anyone tell me what Shop Repair Manual is best to buy?

Thanks in advance.