|It could be the following.|
1. Screen dead
Try to connect to a external monitor and see if anything is coming. (You may need to press fn+ a function key on top to redirect ). If you can see video on screen that means your screen is dead.
2. If screen is not dead then, it has to be the video card. If its video card you need to replace the motherboard. ( not worth repairing).
3. You can still get data from it. You can take your hard drive out and restore data.
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