I’m also having this problem with my e280. If I plug it into the usb adapter it charges but it’s not recognized and the “connected” screen doesn’t even come up. tried everything I read on here and google. Thought it may be the cord so had my friend who has the exact same model bring his cord over but the same thing happened. His e280 was recognized and worked properly when connected to my computer. My next thought is if there’s a connection pin to trigger usb modethat it may be dirty and not sure which one it would be or how to clean it. Any suggestions? I’m glad I can still listen to it but would like to be able to add/remove songs.