HELP ME!!!!? I DONT KNOW WHAT IS HAPPANING BUT MY BACK BUTTON, THE ARROW THING, WHEN I PUSH IT IT DOES NOT TAKE ME BACK TO THE MAIN SCREEN AND IT DOES WHAT THE LEFT BUTTON DOES ON THE ZUNE PAD....... I RESTARTED IT AND IT STILL WOULD NOT FIX IT.... I DONT HAVE THE SOFTWARE BECAUSE I DONT HAVE INTERNET AT MY HOME BUT IS THEIR SOMETHING ELSE I COULD DO???????? WOULD LETTING THE BATTERY DIE ALL THE WAY FIX IT???