I bought this DS lite off Priceangels a while ago, and have had it for a month. Last time I used it successfully was around monday or tuesday. Yesterday, when I was in bed, I tried to turn it on for gaemz, but the only thing that turned on was the green light. The DS itself didn't do anything. I tried again with headphones plugged in, and sure enough, it's not just the screens that don't work, the start-up chime doesn't even play. How do?