I was asked for an interview to solve this problem, and sincerely, I have no clue what could be happenening and how this issue could be solved without restarting the computer. In a few days they'll call me for a second interview and I would like to ask your opinion on this.
Here is the problem:
"You are in front a computer with a monitor, keyboard, mouse. The monitor appears to be in sleep mode -- it is blank. You click the keyboard keys and move the mouse, but the computer does not seem to wake or show anything. Also, you believe that the system may be running something important, and you do not want to interrupt it if it is still running that task.
How would you diagnose the problem and then solve it? Please describe how you would test and diagnose specific possible software and hardware issues; proceed in order of increasing complexity and effort."
P.D. The computer is running Linux, but he didn't tell me which one.