Greetings. I have a 2009 Chevy Aveo LT with a Delco origin al head unit. I recently bought a Coby MP620 player and tried to connect it to the aux input. I also bought a cigarette lighter USB power adapter so that I could run the player with continuous power rather than from its internal battery. But when I powere everything up and try to select the ux input, it refuses to accept the signal, choosing only to display "No CD." Inserting a CD into the player and trying to change only pauses the CD; there's no sound from the MP3 player at all. No, the kicker: when I unplug the Coby from external power, the head unit recognizes the signal and plays the audio. What's causing this and how can I rectify it?
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