If you have a computer monitor that isn’t working, there are several things you can do to test it and potentially diagnose the issue. Here are some steps you can follow:

1. Check the power supply:

Make sure the monitor is plugged in and switched on. Also, check the power outlet to make sure there is power coming to the monitor. If everything seems fine, try plugging the monitor into a different outlet to see if that works.

2. Check the connection:

Make sure that the monitor is properly connected to the computer. Ensure that the cable connecting the monitor and the computer is tightly secured on both ends.

3. Restart the computer:

If the computer monitor isn’t working, restart the computer to ensure that it’s not a software issue.

4. Test the computer:

If the computer restarts, but the monitor still doesn’t work, you should test it with a different monitor. This will help you determine if the issue is with the monitor or the computer.

5. Check the monitor’s settings:

If you can see the computer’s bootup process on the monitor but it goes black later, it could be a setting problem. Try to adjust the brightness, contrast or sharpness settings to see if it makes a difference.

6. Use the monitor’s built-in self-test function:

Most modern monitors have a self-test feature that enables you to diagnose problems with the monitor. Locate this function on the menu and launch it. The self-test will tell you if the monitor is working correctly.

7. Check for physical damage:

If none of the above steps help, you may have to physically examine the monitor for damage. Check if the monitor cords are damaged or if the screen has any cracks.

If you have followed these steps, and the monitor is still not working, it may be time to call a professional. Some problems may require specialized equipment and knowledge to fix. Either way, the above steps should help you through the initial troubleshooting process and bring you that much closer to getting your monitor to work again.