MacBook Pro won't turn on and it won't charge

My MacBook has been working fine and has been charging until now. I left my laptop in without it being plugged in and I presume the laptop died when it ran out of battery. I plugged my charger into laptop but I noticed that there was no charging light on the mag lite charger. I tried plugging my laptop in at different plug sockets and I've tried using a different charger but my laptop still won't charge it turn on. I've only had it just over a year. Any ideas anyone?

Help!