Urgent black screen but power still on?

Hey,
Firstly I'm not sure if I put this in the right place, but anyway. I got a new Hp dv6-1130sa yesterday, I charged it for ages ect. as you do. Then today I was playing The Sims 3 and I think it had quite a low battery left, and suddenly the screen just went black. But the weird thing was that all the lights where still on? So i tried pressing the power switch and turning it off and it wouldn't turn off. I'm not sure what to do now I've tried plugging in the charging cable, I went through all the help in the booklet and nothings working. Someone said about maybe taking the battery out but I don't think that is really safe while the laptop is still on. If it's even on? I don't really know, because the screen is just black put all the lights are on. I'm new to this thing, and I don't have a warranty so I have no idea what to do. Help as soon as possible would be great, thanks. :) x