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Dead display or buttons

The display or the buttons are dead

Coffee button 1 flashes and all else is dark. That is stand-by. Press the button.
A front button is dead or stiff. A retailer's guide: pull the button from the faceplate, clean it, and replace it if damaged.
The main switch has failed. A few reports. The switch is a replaceable part.
A black display, but the machine still brews and steams. One report, with no fix posted.
No display and dead buttons, boilers still powered. One report. The advice given was to check the control box's low-voltage supply, with no outcome posted. That is a dealer job.
A ghost image on the display. One owner got burn-in after a year of 12-hour days with stand-by disabled. Leave stand-by on.