Well 99.9% certain to be electrical.
Might be one of these...
Wall socket
Wall plug
Cable to machine
Connection at machine
The ridiculous safety switch - my most likely cause
Internal wiring - most unlikely
Motor & brushes - also unlikely - you would have had a warning.
If you have some confidence in electrical repairs then find out where the power is and where it isn't - don't forget there may be an open circuit in the neutral return path.
Good Luck...
April 2016