Press and hold the monitor’s Menu button for 10 to 15 seconds
Press and hold the monitor’s Exit button for 10 to 15 seconds
Press and hold the monitor’s Power button for 10 to 15 seconds
Try holding the Menu and Power buttons together for 10 to 15 seconds
Unplug the monitor from power for 30 seconds, then plug it back in
Check the on-screen display menu for a Lock or Unlock option
Use the monitor’s user manual for the exact button combination
Reset the monitor to factory settings from the on-screen menu