Dear utha,
No matter how well intended the advice is, NO buzz is worth risking getting fried for. In my opinion, removing grounds is not really well 'grounded' advice!
Health and safety first.
Systematic elimination of potential sources of the 'buzz' within safe confines next.
Incidentally, do you still get the problem if you use headphones to monitor?
I hope you safely find the solution to your issues.
Kind regards
Pre-Amp