Laptop won't turn on

I have a Hp Compaq Nc6400 laptop and the battery has stopped charging for a while now ( so it's pretty much a desktop now haha) but i was using it and all of a sudden it turned off. I tried turning it back on but no lights or anything came on. I tried taking out the battery, doing the 30 second thing and it still won't work. Please let me know if there is anything i can do about this.