You should try to connect your laptop to external display and use the same resolution as on your laptop internal screen. If the picture is good, there are 2 possible solutions:
1. The wire connecting the screen and your laptops motherboard could be lose. Use screwdriver to disassemble the laptop so you can see both ends of that connector and make sure that they are on place. In some laptops it is enough just to take off the keyboard and you can see the other end of the cable. Try to push that one to place before dissassembling more.
2. If that doesn't help, I would try to change the entire screen. While doing this you should remember that you laptop doesn't necessarily need the original spare part, you might find one for free from one of your friends old broken laptops, as I did, it doesn't even have to be same make and model. (Mine was packard-bell laptop, and I took the replacement screen from my friends old HP, the most important thing is that it is the exact same size).
If the picture is the same when connected to external display (this is wery unlikely in this case), your display card is broken, in some laptops you can replace it, but in most cases you cant. To help you furter, I would need to know your laptops make and model.
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