Another question for ya Al

Or anyone else. So awhile back I had a ground loop hum / hiss that was slightly irritating and it went away when I switched to xlr's, from rca's, between my amp and pre amp, but I may be using this amp for center channel duties and only have an rca output for my center channel and now the hum is back. Anyways, when I posted my hum question awhile back I got a few people suggesting that I buy a cheater plug that takes the ground out of the equation so I just unscrewed the ground out of my p.s. audio power cord going into my amp and the hum is gone, but I'm wondering if this is a. bad for my amp, or b. dangerous for me as I already have wicked static electricity and am worried about electrocuting myself on my amp (trust me, if you saw the sparks I'm shooting, you'd ask the same question).

Thanks for your input everyone!
:-)