Electrostatic dangers?

A few times, I've gotten up from my couch to turn the volume control, and when I touched the knob it sparked. I recently connected my cable to my Monster power conditioner, and now there is ground-loop hum coming from my speakers. The only way to get rid of the hum is by using my 2 prong YBA diamond power cord. If I use this 2 prong power cord, and there's another electrostatic discharge occurs, will my amp be damaged? Did my three prong power cord save my integrated amp from static electricity?