Saeco Vienna De Luxe Espresso Machine "nook stopped" Questions

...There must be a sensor or switch that is stuck. Often the grindings find their way into the nooks and cranys thasurround the mechanism. A bit confused on the grinder off light blinking when ...

stopped dispensing Cleaned brew group and have descaled. I can hear the beans grinding, there is water in the resevior and the waste bin is empty but coffeee is not coming out. The last 'cup' was just