Monitor light is on, but screen is black


Symptoms

Monitor is black and will not show anything, though it has power

Cause

This could be due to an Invalid scan frequency, though it could be other problems.

Resolution

1) Check the monitor cable and make sure that it is connected tightly. Try unplugging it and plugging it back in.

2) Try turning off the computer and turning it back on. This process may help bring the monitor video signal back.

3) If you have a monitor that has multiple input possibilities, then make sure that correct input is selected for output.

EXAMPLE: Many monitors have multiple methods of connecting, such as HDMI, DisplayPort, DVI, USB-C, Thunderbolt, etc.

4) Sometimes a power outage or a brief disruption of video could cause the monitor to switch to a different mode for input.

5) If the monitor is still not receiving any video signals, then it's possible that there may be a problem with the video adapter on the computer. Try switching out the video adapter or the monitor.

6) Check display sleep settings/power settings.

7) Check which monitor is set as primary/secondary.

8) If you have an Apple Thunderbolt Display, try resetting it.

9) If you have a Dell monitor, try running a self test.

NOTE: The remaining steps are for Windows only.

10) Start your computer in Safe Mode.

11) Check Device Manager for anything unusual, such as two monitors or two video cards.

12) Right-click on your desktop and choose Properties.

13) Go to Settings > Advanced > Adapter tab.

14) Check the adapter. It may show the wrong monitor type even though the Device Manager will be showing the right video adapter.

15) You can reinstall the drivers or reboot the computer. Normally, a reboot will correct the problem.


OUTCOME

Your monitor should now display correctly.