I have an 04 cts here and the navigation screen all of a sudden turned upside down and backwards. It all works but you need a mirror and have to stand on your head to read it. Any ideas? Cadillac said they have never seen this before but that was only one dealer. Thanks alot.

 

Either a) try and figure it out yourself..
or b) buy a used factory Navugation system from eBay. Here's a link:
http://cgi.ebay.com/ebaymotors/05-06...fAudioQ5fVideo