Dell IN1930 User Manual page 19

Input Source (for IN2030M
only)
Auto Select
VGA
DVI-D
COLOR SETTINGS
Use the Input Source menu to select between different video signals that may be connected to your monitor.
Select Auto Select to scan for available input signals.
Select VGA input when you are using the analog (VGA) connector. Push
Select DVI-D input when you are using the Digital (DVI) connector. Push
Use the Color Setting menu to adjust the monitor's color settings.
to select the VGA input source.
to select the DVI input source.