|what you need to do is diagnose the problem and understand if it is the graphics card or the screen, so here is what you need to do:|
1) plug a monitor into the laptop via the VGA port, you may need to press the Fn key and the display key to make it display to the monitor. if you see windows booting on the monitor than it means your laptop screen is dead, but this can easily be changed. If you do not see anything then it means your graphics chip is dead and that is very difficult and expensive to repair.
Try this and let us know what you find. make sure that you do press the Fn key and the display key a few times to make sure you send the display to the monitor.