A. “Can you avoid using the PC that crashed?”
B. “What was the last thing that occurred before the PC had problems?”
C. “What were you doing before the PC went down?”
D. “What was the last thing you did before the PC crashed?”

A. “Did you log in with an administrator account?”
B. “Have you been to any inappropriate websites?”
C. “What have you changed since the optical drive worked properly?”
D. “What has changed since the optical drive worked properly?”