well first thing i would is check the motor brushes. most machines have them but not all
pull machine out
tilt it back at approx 45 degrees and climb underneath with a torch
find the motor brushes and if you find them take a screw driver and tap both brush holders 2 or 3 times firmly
then put machine down and try it
if it works you will need to replace the brushes. if you want to use before then you would have to take each brush off and spring it in and out to try to get a few mm extra so it can be used. to do the you will probably need a 5.5mm socket
if it does not work it does not mean the brushes are not faulty they will need to be romoved to find out
Dave