[EasySt]

You might try plugging an external monitor in it, to see if your screen has died, or the video circuits have died. You can try a strong flashlight against the screen to see if it’s only the backlighting that has died. You can try running it on AC with the battery removed. (Dead battery if that works...)

You can open it up, blow out the dust with a can of compressed gas, remove and reseat the memory modules and any other easily removed modules.

[roadcat]

You might try plugging an external monitor in it, to see if your screen has died, or the video circuits have died. You can try a strong flashlight against the screen to see if it’s only the backlighting that has died.

What EasySt said. It's an easy task to replace the backlighting tube on many laptops. I've done that. With other laptops, you can also easily replace the monitor panel, often by buying a secondhand cheap laptop.