Hi! It seems that I have some problems with the black level feature on the Denon DVD-900. I've tried to contact Denon without luck and I can't find anything in the manual about this. The problem is that I can't turn black level on or off. It seems like the player switches between the two modes automatically. Do some of you know how to fix this issue? And what purpose does this feature have anyway? I know it's something about gamma control but how does it work? UPDATE: I use RGB Thnx in advance!