I've just got my Panasonic TH-42PWD4 plasma scrren and am VERY happy with the picture quality. However, the screen makes a very loud humming noise! When you are watching a loud part of a film you don't notice it but it is VERY noticable during the quiet parts! I've searched the forums and understand there can be a problem with this. My question is does it effect all of the TH-42PWD4's or just some? Should I return the screen or am I going to have to get used to it? Thanks for any info, Glenn.