answer: #Person1# calls #Person2# to check the problems of the computer. The screen suddenly went black, so #Person2# guesses the overheating is the cause of the problem. #Person1# lost all the files and he learns to save them at any time.
documents: #Person1#: Thanks a lot for coming again.
  #Person2#: Tell me what happened this time? Is it the keyboard again or the mouse?
  #Person1#: Well, the keyboard is ok now, and the mouse is working well, too, even though you suggested that I get a new one last time. Actually the problem is when I was working this morning, the screen suddenly went black.
  #Person2#: Ok, let me have a look. The screen seems to be working, so I'll take a look at the inside of the laptop. Did you save your files?
  #Person1#: No, since I didn't know that the computer would stop working. Please don't tell me I've lost my report.
  #Person2#: I'm afraid so, here's the problem. Something has overheated inside the laptop.
  #Person1#: Can you fix it quickly?
  #Person2#: I'll try. It may take a couple of hours. I'll have to take it back to my shop and fix it. I'll test it before I call you. Can I contact you on your mobile phone?
  #Person1#: Of course, I've learned a lesson today.
  #Person2#: What's that?
  #Person1#: Always save your files when you're working on the computer.