9. As you boot up your computer system, nothing is displayed on the monitor. You check that the monitor is turned on and that all the power cords are plugged into a working source of electricity. What should you do next?

A. Ship the monitor back to the manufacturer with a written description of the problem.
B. Look inside the monitor case for loose or broken wires.
C. Check that all cables between components are securely attached.
D. Call an electrician.