5. power on – VIEWSONIC VA2456-MHD_H2 24" 16:9 IPS Monitor (2-Pack without Stand) User Manual
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3.C. 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.
2-5. Power On
Turn On LCD Monitor and Computer
Turn ON the LCD Monitor, then turn ON the computer. This
particular order (LCD monitor before computer) is important.