VIEWSONIC VG2455 24" 16:9 IPS Monitor - Manual (Page 19)

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A. Power Cable (and AC/DC adapter if required)
Connect the female connector of AC power cord to the power
connector of monitor, and the AC plug of AC power cord to the
AC outlet.
B. Video and Audio Cable
Connect one end of the DisplayPort cable to the DisplayPort or
mini DP connector on the rear of the monitor*. And connect the
other end of the DisplayPort cable to the DisplayPort or mini DP
connector on the computer.
For a computer or other source device with HDMI output,
connect the HDMI cable to the HDMI connector on the rear of
the monitor and the HDMI port of the computer or source device.
For a MAC with Thunderbolt output, connect the mini DP end of
the “mini DP to DisplayPort cable” to the Thunderbolt output of
MAC. And connect the other end of the cable to the DisplayPort
connector on the rear of the monitor.
*This picture is for reference only