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Whether or not you have the gain turned all the way down - whatever is "buzzing" still causes interference.  If you unplug the "brick" completely (and unplug the microphone as well) and you are still getting the "buzzing" - you have something else in your shack causing the problem.  Now, I am assuming you didn't have this problem until you started using your new microphone.  IF after unplugging the microphone and "brick" and you still have the noise - start unplugging stuff around the room and see if the noise goes away.  Now, even if it doesn't - check your other rooms because the noise could be generated along the AC line feeding your wall outlets.