Navigation radio problem

I have the U-connect radio with navigation and six CD changer. My problem is when the car is completely off, the back lights stay on, they also stay on when the car is on. But the radio itself will not turn on. The only time the screen turns on is when you try to enter or eject a CD from the changer. Nothing else, as soon as it is done ejecting the screen turns off. I have the Boston audio package as well.