Sounds like you either have a damaged cable to your laptops monitor, or your RAM/memory went kaput.
If you have an HDMI port on your laptop you can try plugging it into a TV and check to see if you get a signal.
If your laptop has more than one stick of RAM and it's accessible you can test them by removing one, turning it on, check for video and if so put it back and remove the other one. If you get video with one of the RAM sticks removed, its a RAM/memory module that died. If you only have one stick of RAM, you can't really test it. Id just take it somewhere to see if it could be repaired if it's worth keeping.