Recently purchased my 2005 CTS V. Awesome car, but the Nav screen went completely blank. The audio is still working so I’m confused. I checked all of the fuses and they seem to be okay. I pulled the unit out and re-did all of the connections and that didn’t seem to help. I’ve had it turn on at random once, and the screen didn’t look messed up or anything similar. Has anyone else had this issue and is the fix to just get a whole new unit?