Samsung LS19NVBHBV-ZA - Manual (Page 17)

Installing the Product 2-4
Switches the LCD Display On/Off.
Supplied for the wide models only such as 16:9 or 16:10.
When the product is connected to a PC, you can turn the product on and use it.
When both the DVI (<digital>) and D-Sub (<analog>) cables are connected, you can select the input signal (Analog/Digital )
by pressing the [
] button.