My recently installed 434 has a buzz coming from the screen which is audible from 4m away with the sound at normal levels. I gather from other threads that some noise is normal but it does seem to be excessive on my screen. Does the buzz diminish over time or stay at the same level? If this is the case I think the screen will have to go back. Incidently the media box is very quiet. Also, I have read much on other threads about set up discs but I am still slightly confused as to how you use them and where to get them. Any help would be much appreciated.