Look at it in the light and look really close and see if you can see anything. if you can like barely see the xmb icons and stuff your backlight went out, this happened to me one time when i was changing my case, but mine didnt go out when i plugged it in a bend the cord a little and that messed it up. check for kinks and bends in the backlight cable, which is the smalller skinny one. its its not messed up make sure its in there all the way.