used the iConnectAudio 2+ on Sunday. Came back Monday morning and the unit will not respond to anything. Power supply is good and outputting 9V. I can hold the rotary knob down for a few seconds and I get two flashing yellow LED's on the meters. But that's it. Wont respond to Apple via USB or iOS. Wont pass any audio. iConfig on computer and iOS will not recognize that there is a device connected. Any ideas?