okay so everytime i try to turn on my device it quickly flashed the zune logo then shuts off. so i tried plugging it into my computer. thne it loads completely, then goes back to loading over and over again. the only way i can do anything is if its plugged into my wall charger. then it works fine! so i unplug it and it stays on. then i press a button thne it shuts off. PLEASE HELP ME!!!