I have an old SR1 radio that I use in my car, it's not built into my car, but plugged into the cigarette lighter. When I turn the car on and the radio on, the screen on the radio just shows "Sirius" and that's it. No matter which buttons I press, I cannot hear music or change the channel. The display remains the same. I tried turning it on and off again, changing the plug, unplugging and plugging it. None of these things work. I miss my radio! Can anyone help?