I am awaiting a replacement for this set which I consider to have three major problems:- Vertical staining - well documented here Buzzing - far too loud Inconsistent black levels accross the screen Has anyone else encountered the last problem? Is there a cure? Basically on a black background, the middle third of the screen is pure black and as you go further out to the sides, the picture gets lighther and lighter. It's almost grey at the edges! Any ideas?