I see what buzz means by turn the receiver on first and the order of the video path and he's absolutely right. I don't do it that way but I think we're both right for different reasons. I personally don't mind that message coming up so long as it goes away and video starts after a couple seconds. The point is the TV won't take a different input command until 10 seconds or so after it's turned on but that's a relevant because it should be left on one input.

Actually the Marantz may come on automatically with the input command, so you shouldn't need a power on delay for that. Some AVRs do that some don't.