By MENU button - I mean the one along the right side of the navigation screen. Okay - it is odd that of all the buttons to stop working - the one least often touched - suddenly quit doing its duty! Any other forum member have this happen? Any suggestion as to the correct way to access the "working" of the button. I do not have the gumption to simply try and pry it away. The idea came to me thinking the contact point when its depressed must be compromised in some way - and how is is accessed? My vehicle is a 2008 IS350 with navigation and entry level stero system. (Not the Mark Levinson).