I have a 1999 Grand Prix GTP with what I believe to be the standard CD player. Occasionally, the LEDs on the display are unlit/lit inappropriately and flicker. Sometimes it goes away as I drive, sometimes it does not. I'd say about half the time I put the key in the ON position, the issue comes up. Otherwise the unit works perfectly fine. I'm guessing this might be a bad grounding issue? It doesn't seem to matter if the car is running or not. Pictures: