I had this problem myslef. The power supply would hum so bad that I could here it over the music. It took a lot of questions and looking but I found the problem to be that there was something else that was sending contaminating power back through the electrical system. At the time I lived above a bueaty salon. When I moved the problem went away. If this is the reason a power condiotiner may help. I would try plugging it into a friends system and seeing if the problem is sill there..
