Hi, I have a 1.5 year old Macbook and it's been working fine except just now when the power ran out and it shut off. When I tried to recharge it, it wouldn't turn on. I tried taking out the battery and putting it back it, with and without the charger plugged in but it still won't turn on. Also, the green light on the power cord turns on but it's very, very dim. What is wrong?? Thanks.