A computer crash

A: Something's wrong with my computer.
B: Exactly what?
A: All I get is a black screen.
B: What's the matter?
A: I think I know, because this happened before.
B: What happened before?
A: My hard drive crashed.
B: Oh, no. That's bad news.
A: It sure is, but I'm going to call HP first, just to make sure.
B: Will you lose all your files?
A: No, I always back up my files.
B: You're smart.