After the countdown clock finishes I select and load a specific panel and as I began to program the FMS through the 'initial" page and enter the last item of "cost index" I proceed to the next screen only to have the entire display go blank and it does not come back. The FMS head on the throttle quadrant is still showing it's operable, but when I select LSK L6 (shortcuts) the display blanks as well and I can't recover. I have not had a problem until today? Ideas?

Maybe try it without loading a "specific" panel? I assume the DUs are still operating?