laptop won't boot.. I think..

Alright so last night before I went to bed, I shut my laptops screen (Like I do every night) which makes it sleep. I woke up this morning and I opened my computer, usually I have to press the space key to make the screen turn on.. But it wouldn't turn on, So i noticed the battery light wasn't on. So I thought "Oh it must have turned itself off" So I pressed the power button to turn it on. And it makes the sound as if it's about to boot up and then doesn't. But the power light stays on. So I said "Hmm okay" (My computer has had battery problems in the past.) So I turned it off took out my battery and tried running it off the cords power. Same thing, So that's where I started wondering what the hell was going on. If it's not the battery and the cord was giving it power.. Why wont my screen turn on? Or more importantly why isn't my computer booting up. Answers would be appreciated.