since your planing on using a BeoVision, I'm assuming you don't have one. So I'm assuming then you only own an audio master. If thats the case you really won't have much use of the menu button till you get a BeoVision. The menu button activates the television overlay and customer adjustment menus on BeoVisions. You will never see menu in the lcd of the Beo4 itself when pressing it. If it's operating your current equipment and will change to a video command such as DTV, TV or V.Mem on the lcd of your Beo4. Then you should be good to go. Or take it with you next time you visit your dealer and try in their shop.
BV7-40 MKIV, BeoVision Avant 32, BeoVision 8-32, BeoLab Penta MKIII, BeoLab 6000 x 3, BeoSound 9000 MKIII, BeoLab 7-4, BeoSound 4000, BeoPort, BeoVox S45-2, ML/MCL Convertors, A8's & Form 2's.