I bought the Fender Mustang LT25 and having a number of issues. 1. When connecting USB it says "No Device Connected" 2. The fender tone screen told me to turn off, then on and hold the "press to edit" button for 3 seconds, after doing this I am unable to get the amp to work anymore as I no longer can get to any preset or play the amp at all, it's like it's turned the amp off and it cannot be turned back on. HELP WILL NOT TURN ON!!!!