Hi there...
firstly is this blender a USA or UK model and do you have a Multimeter handy?
if you can remove the fuse from the plug (UK only) and test t through diode mode on a multimeter or Continuity test across the fuse terminals... if it beeps the fuse is good if nothing the fuse is blown
we can move on from there
Same thing happen to my blinder, it uses 5A fuse 250V. But even if you replaced the fuse it still blow up... some other issue related that make the fuse blow