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If your MFD's menus are not accessible, perform use the Power On Reset feature:
Press and hold down the first soft key (next to the power button.)
Keep holding the soft key down while the display reboots. A "Factory Reset" countdown will be displayed. Keep holding the first soft key until the countdown is complete.
The display should reboot into normal operating mode.
Once your display has returned to normal operation you should check its operating software version, and upgrade to the latest version (if applicable). The currently installed version of software is specified within the “Navigational Warning” or “Limitations On Use” dialogs which must be acknowledged each time that the C-Series and E-Series MFDs respectively are powered on. Please refer to the following answers for more information on software updates: