Possibly a ground issue , do you have everything plugged into a line conditioning power strip? are your speaker wire,s plugged into the red and black speaker connectors propperly,and are the positive and negative wires in the right order? also check that the component or hdmi cables are not the issue , but usually the buzzing noise would sound more like a ground issue , I hope i was able to help you solve your issue if not feel free to contact me again so we can tackle this issue together , if i was able to help you pleace leave a nice review ,thanks alot ,Sincerely glenn mayer