Dell LCD Monitor service menu

Service mode / Factory Mode Dell LCD Monitor
Dell LCD Monitor off mode, Press and hold the "AUTO" & "+" button, some models use the "ENTER" and "+", then press power button, press the "M E N U" button to open the OSD to displayed.
In the bottom of the OSD, you will get additional_menu "FACTORY".
Select "FACTORY" and press "ENTER" to enter the factory mode.

DELL UltraSharp Monitors
Award-winning monitors with vivid color, advanced connectivity, and performance.
P Model Monitors, Boost productivity with these visually brilliant, eco-efficient monitors.
Multi Monitor Solutions
Increase productivity and enhance
business capabilities.
E Model Monitors
Powerful: Experience IPS technology, featuring a wide viewing angle with high-quality color representation for a peerless viewing experience.
Flexible: Pick the view that works best for you with an almost unlimited range of tilt, swivel, pivot and height adjustments.
Customizable: Change your energy usage settings, text brightness and color temperature with the touch of a button to help conserve energy with this eco-designed arsenic-free and mercury-free panel.
Reliable and essential features that drive business efficiency.
Monitor Deals
The right picture at the right price,
displays for any budget.
 Great performance, no matter how you look at it
Enjoy widescreen performance, any way you want it. With a 24" 16:10 panel, IPS technology and LED backlight, the U2412M provides a brilliant view, plus amazing adjustability to suit any style.