The Dell monitor connected to your computer contains a series of menu screens that let you change options such as the brightness, image position and colour settings. If you want to protect the current settings, or prevent an option from changing if someone accidentally taps the wrong button, the monitor includes an extra lock feature. When you are ready to change any options, unlocking the monitor's menu is only a matter of tapping the appropriate button combination.
Locate the "Menu" button at the bottom of the Dell monitor. Tap the button to bring up the "On Screen Menu" (OSD) display.
Tap the down arrow key, located next to the "Menu" button, to scroll through the menu. Navigate to the option labelled "OSD Lock."
Press the minus symbol button at the bottom of the monitor to set the "OSD Lock" setting to "No." Tap the "Menu" button again to exit the menu.
Some Dell monitor models also let you turn off the OSD lock option by simply pressing and holding the "Menu" button for 15 to 20 seconds. If you want to turn the OSD lock feature back on, tap the "Menu" button and use the down arrow key to scroll down to the "OSD Settings" option. Tap the plus icon button and scroll down to the "OSD Lock" option again. Tap the plus icon button to turn the lock on, and press the "Menu" button to exit the menu. The "OSD Settings" menu also lets you change the vertical and horizontal positioning of the image on the screen. Scroll to the "Horizontal Pos" or "Vertical Pos" option and tap the plus or minus icon buttons to move the image up, down, left or right.