AFAIK, and from experience, you won't electrocute yourself by holding a paperclip to the green/black to turn it on. I've done this several times, with several power supplies, with my bare hand and a paperclip, and never been electrocuted. The green wire does not supply power, and the black wire is just a ground. If you're afraid of being electrocuted still, then just hold the paperclip with a clothespin or something. All you need is a momentary contact (while the power supply is plugged in and switched on) to start it. Stick the paperclip back in for 5 seconds or so and it will turn off. Just make very sure to only hit green and black or you're likely to fry something.