Samsung LS20MYYKF-XBM - Manual (Page 11)

Connections
{2043SN/2043SNX} Connecting Cables
Connect the power cord for your monitor to the power port on the back of the monitor.
Plug the power cord for the monitor into a nearby outlet.
Use a connection appropriate for your computer.
Using the D-sub (Analog) connector on the video card.
• Connect the signal cable to the 15-pin, D-sub port on the back of your monitor.
[RGB IN]
Connected to a Macintosh.
• Connect the monitor to the Macintosh computer using the D-sub connection cable.
Note
If the monitor and the computer are connected, you can turn them on and use them.