Samsung 710TM, 910TM, 713BM, 913TM Owner's Manual page 13

Kensington Lock
Headphone connection
terminal
AUDIO IN
See Connecting the Monitor
The Kensington lock is a device used to physically fix the system
when using it in a public place. (The locking device has to be
purchased separately. )
Connect the audio cable for your monitor to the audio port on the
back of your computer.
for further information regarding cable connections.