Anyway, if you have just bought it, then you may want to return it and get a new one, I don't think there's a warranty covering 1 dead pixel. I think the easiest way would be to return it if you're still within the returning window.
Hello  I just purchased an XPS 17 9710 laptop with   premium guarantee until December 28, 2022; I noticed that a pixel was dead? It remains white regardless of the color of the screen. Is there a procedure to fix the problem or if not, is the screen guaranteed for this kind of defect? Sincerely Pierre Papin
dead pixel