Sounds to me like you are saying the computer turns on but gets no further than the vendor screen on the monitor.
"DELL" screen is not a screen saver.
It is the BIOS (Basic Input/Output System) screen presented used by Dell when the computer first starts up and is waiting for the operating system to take over and start running. What you see is the Dell screen with the BIOS running hidden behind it.
Has nothing to do with the monitor.
A monitor is a human interactive device we use to interact with the computer, just as we use a keyboard or a mouse to control it.
Your computer is not starting Windows for whatever reason.
Please do tell us what happened just before you had this problem.
hard turns on but, monitor is stuck on the DELL screen. How can I get into the control panel to disable the screen saver if the screen dose not come on? The five controls below the screen do work but, they control only the brightness, etc. The "F" keys do not respond also. In a quagmire and can't get out. Please! help. Don out, or should I say in.