Please help if you can, a couple months ago I bought a car with this unit in it. I have no mam
I have no manual or instructions how to operate it. The nav seemed to work ok, the radio works ok, it accepts a cd and showed on the screen that it was playing but no sound, same thing plugging in a thumb drive, shows tracks and shows track is playing but no sound. I also bought an HD radio for it, but it doesn't get any stations. a couple days ago the screen went black after it boots up. the radio still plays and the nav says lost signal when going thru a tunnel, but nothing on the screen.