AS501 and E176FPc - Cannot find power port

I feel like a real rookie as I'm a computer programmer and should be able to figure this out.  But its stumped me.

I went on vacation and came back to find my house-sitter's kids had unplugged my AS501 sound bar.  My problem is that no matter were I look on the monitor I cannot find where to plug it in to get power.

There are two cords coming from the AS501 sound bar.  One ends in the green plug and is properly plugged into the green input port on my Dimension E310.  The other is to plug into the Speaker Power port on the monitor ... but I only see ports for the monitor power power cords and the blue plug that runs the signal to the desktop. 

I'm not finding the 3rd port at all where to plug in the power bar and I'm feeling that I'm going to feel dumb once someone tells me where to look ... but I just cannot seem to find it.  (and neiter could my son).

My monitor is a E176FPc ... so if anyone knows where to find where to plug the AS501 sound bar to this monitor and can tell me ... your assistance will be VERY much appreciated.

Thank you!

Tom