This doesn't sound too good.
I've just had a look at the wiring schematic for that machine.
If the machine was switched on when the stand severed the blue and yellow wires, this would have created a "short" return to the controller and possibly damaged it.
Before we assume the worst you need to carry out the following checks.
Switch the machine
on...The "talent" battery state meter on the handlebars should light up. If it does, but there is no power to the motor then the controller may be damaged.
If the battery state meter does
not light up, then you need to check the fuse on the battery. This is behind a black cap next to the charger connection. The fuse is a 20 amp ceramic "microwave" fuse so you will need a multimeter to check it. If the fuse is blown you can usually find them on Ebay sold as a twin pack or contact Synergie Bikes who may be able to send you some. If you have a domestic appliance repair shop near you they may have them.
If you need any more help then post a reply and I'll try to help if I can.
Fingers crossed
Link for fuses
Regards
Bob