Hi There,
The best way to begin the troubleshooting process for your problem is to connect your laptop to an external monitor. If you don't have one at home I hope you can ask a friend to allow your to use theirs for a few minutes.
With the laptop off, and the monitor off, connect your laptop to the external monitor. Next turn on the monitor. Finally, turn on your laptop and on one of the F keys in the row of keys above the regular keyboard letters should be one key that either shows what looks like a little monitor screen/screens or as on most Dells, one key will say CRT on it and it's usually the F8 key.
Hold down the fn key in the lower left hand corner and hit the F key as described above that's assigned to make you switch from the laptop screen to the external monitor.
If the monitor ahows what you'd normally see on your laptop screen, then you know that your laptop screen has worn out and needs to be replaced. If both screens are black then your problem is much more serious and the odds are greatest that your video card/controller on the motherboard has failed. For most laptop repair guys this means replacing the entire motherboard.
I sincerely hope the problem is the first one because it's the least expensive. If not, I'm sorry to be the bearer of bad news, but then you at least know the truth of your situation. Also, a favor? If the worst case scenario, remember I didn't do it (grin) so please don't thrash my reating. I'm a professional laptop repair specialist just trying to lend a hand.
Best of luck to you.
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