I just got a HS2 with the ground cutoff too. I didnt think too much about it (or even notice ) when I plugged it in. I was getting shocked anytime I touched the playfield rails of HS2 and the machine next to it (with HS2 on) . I unplugged the machine and noticed the problem immediately. I bought a $2 plug from home depot (in orange), installed, and no more shocks. It took about 5 mins to install.