user complains that his monitor is not working. You must diagnose the problem to return the monitor to normal operation. What are the four primary sources of display problems?

The four primary sources of display problems are;

1) Monitor

2) Video Cable

3) Video driver

4) Video adapter card

Explanation:

1) Monitor

A computer monitor also known as a video display unit, VDT, or video display terminal is an output device that displays pictorial information sent from the video card

2) Video cable

The data connection cable from the monitor to the video card

3) Video driver

The program that enables the operating system work with the installed video card

4) Video adapter card

A card converts image data information into images information for display by a display output device.