difference between the information in CMOS RAM and the actual configuration, you see a prompt to run the Setup program.
Whenever a configuration change has been made to the system and power subsequently applied, the BIOS (Basic Input/Output System) will generally generate the invalid configuration message. Pressing Fl after an invalid configuration message is displayed will cause the system to boot up with a minimum default system. This will result in the system not being able to operate with its full potential.
If POST detects an error, you are prompted “Press <Fl> to
RESUME”
The setup program performs the following operations:
Displays date, time, and the screen the list current values for system options.
Allows you to accept current (default) values or enter different values for time, date, and system options.
Provides help information about each of the options.
Provides instructions on
Whenever the system is booted, POST always rechecks the stored setup information against the hardware configuration. If the data does not agree, the invalid configuration message will be displayed.