In looking at my office computers, I see Gateway is pretty consistent with its power buttons. I didn't realize a circle with a vertical line is the "universal power symbol." Their older tower cases do not have lit buttons.

My coworkers most often leave on their PC speakers and/or their UPS units... and printers. My god it is difficult to find the power switch on a printer. It's often in an obscure location on the side or back of the unit! Doesn't everyone do the "blind feel?" You know, passing your hand all around the printer feeling for the switch while your eyes aimlessly drift toward the ceiling.