Sorry that you've been having so much trouble with your USB port. There are issues with the PDIM where it will periodically not respond to messages from the radio which is when you will not see the Aux jack when pressing the CD/AUX button. This issue should be resolved with a software update coming at the end of July. I'll post a message when the update is available. I don't think it's a matter of connection or the iPod that you're using as I've heard of this from multiple people.