I would check the connection to the backlight with a mutiimeter make sure to check that the cable did not come lose. You should only need to replace the backlight if that is an issue. I would check the laptop with an external monitor to see if it an issue with the screen or it is something worse like an issue with a component related to the display. I do not know if there are any signs of life like a startup sound but that would mean the laptop is still fully functional. Be very careful and do not apply any pressue to the display. If glue is used you may need to purchase some isopropyl alcohol get 91% as low purity can act like water and damage components. Hope this helps.