If Dell Display Manager will not recognise your monitor
You may face this annoyance, Dell Display Manager does not always recognize your Dell monitor. I use this little Dell program, I really need it, and I was going mad!
As I realized problems appear when you use two or more monitors and the program is confused, or when it starts too early and the system doesn’t have enough time to give it necessary information about your monitor.
Whatever your particular case might be, you can solve the problem easily by just removing the program from the Startup folder (you can do this by pressing Ctrl+Shift+Esc to open the Task Manager > Startup Tab). Then configure Windows Task Scheduler to run it with a delay of a few minutes after you have logged on.
This way you will give to the system more than enough time to inform the Dell Display Manager about the identity of your monitor(s).