I installed the unit in the trunk and I pushed the CD button and I get a response up front with "CD" followed by a spinning disc. I also get numbers for what I suppose are folders (1, 2, 3…) followed by higher numbers for songs? It is as if it is scanning. I can change the folder number but not the song numbers, they have a mind of their own. In the back the thumb drive is blinking up a storm. I get no sound. I do know about controls for intercom suppression etc. but I wouldn't swear that I have everything where it needs to be. I have 12 songs loaded on the root drive and maybe that many in a folder. HELP