Hmm, if it's stuck at the logo, so the JBL doesn't do anything... but it responds to your computer... can your computer look into the JBL and see it and can you know that by using Windows Explorer and file manage the little onboard storage there? If so, maybe you could go further and, oh, reformat the jbl or something like that? Ken is a zillion times more knowledgeable on that part of it than I am, but if you can get your computer to talk to the jbl, maybe your computer can poke it and bring it out of its funk
Just a thought.