I have a Cyberhome ADM512 multi-region connected to a Limit 5.1 system. Whenever I play a disc I get a loud buzzing type noise coming through the speakers. This is particularly noticeable when viewing silent pictures e.g. main menu or when a scene changes in a film. The noise can still be heard when viewing through a SCART lead but is not as loud. The only time that the noise disappears is when the disc is ejected. Anyone had a similar problem?