this monitor is basically a modified D9400 D9700 series chassis on a 19" monitor tube.
if you do not have the matching power cable for it, just cut off the end and wire on a standard AC plug.
the white/black/green cable is your power. it follows standard north America wiring nomenclature....
green is attached to ground pin of electrical plug.
White is AC neutral connection (typically the wider blade of the plug)
Black is AC hot connection (typically the narrow blade on the plug)
this monitor has a switchmode power supply that does not require an isolation transformer, so you may plug it directly into the wall if you so wish.
be warned if this is your first time dinking around with monitors, be aware, there is tens of thousands of volts present when it's plugged in and running... even after it's been powered off, it can retain this voltage... i suggest you DON'T TOUCH ANYHTING on the monitor when it's powered... the only thing that is okay to touch in operation is the UI control board to adjust your settings.