either your graphics card took a poop, or the wires/connections to your screen (the screen hinges) are broke.
try plugging in an external monitor or TV to your laptop, I'm assuming it has a VGA or DVI or HDMI port on the side somewhere. If you get a picture, then the wires are probably bad.
Probably CPU not working. Or maybe screen gone. Or maybe cables between screen and keyboard damaged. If new, then return it for refund or replacement. Else take it in for repair.