so the easy thing to do is just hack it again by putting a power cord/switch on it again...here is a pic of something similar...it's on my test rig, but the same premise...

the switch I'm using is from an old ps2 lol, so I'm sure you can find something...
sorry bout the blurry pic...I don't really know how to use my wife's fancy camera lol
there are several ways to go about hacking it, like wiring it into the existing power switch, running it straight to the wall, etc....largely personal preference as to which you go with...in my pic, the switch is wired to the power supply which in turn is wired to the monitor(so it turns everything on, not just the monitor)...you might want to look into doing something similar...hope that helps...