Problem:

Screen is black, except for a message that says 'Power Button is Locked'.

Scenario:

If you’re getting this message on your monitor then you might not be able to turn your screen off.

Troubleshooting Steps:

Fix #1:

Disable the monitor’s Power Button Lockout Function by pressing and holding the power button for 10 seconds.

Fix #2:

If the first fix doesn’t work, then you can do what is called a factory monitor reset. Simply unplug the monitor from the wall. Then press and hold the power button for 40 seconds. Then plug the monitor back into the wall and turn it on.