All of a sudden when I go to my Machine Xerox Workcentre 7225 the screen will not let me choose what function I want to use. It will not let press the buttons and change the screen. It will however change when I open the Paper tray or another door. I can print remotely but am unable to scan or copy from the machine itself. Online it is showing no error codes and it will not let me access any of those screens on the Machine itself. It was working all day fine until it just stopped.