If you can hook the laptop up to an external monitor of some sort then the laptop is fine, the screen itself is dead. Though it looks like you tried to do that with a TV. Just in case, I would try to see if you can't get your hands on a computer monitor of any sort. If you can't get any signal from an external monitor then I would have to say that your laptop could be dead even if the lights are working. If not dead then at least you would need to change out the GPU (if separate) or the entire motherboard, which can be expensive.