Hi, Avionic,
You recapped my C4 a few years ago. Starting yesterday, I turn it on and it works for a while, but then there is a popping noise from the speakers and the lights on the C4 fade out and music stops playing. When I push the power button in to turn it off after that happens, the lights come on for a second when the button is pushed all the way in and then they go out again when I let go of the button.