If you find you do have a ground loop issue mastaplaya and if you do not feel comfortable defeating the ground, I posted below an excellent article by Alan Lofft which shows a methodical way of tackling this issue.

http://www.axiomaudio.com/tips_eliminate_hum.html

Cheers,

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne