Ouch. That doesn't sound good.
Is the blade seating & locking on the spindle? Try turning it with your hand (unplug the blender first!).
Examine the underside of the blade, and the spindle, for cracks.
If you find a problem here, it may be a simple matter of replacing the blade assembly.
If not, try running it dry... no blade, no container. Just short shots of one second. Is the spindle turning? If it turns, then put the container & blade back on... but just put water in the container.
If the blade turns, whipping the water (but doesn't turn if you put something more dense in it), that suggests that your bearings are going out.
In summary:
- If the spindle turns but the blade doesn't turn, look at your blade assembly. (Plastic can hide a crack.)
- If the spindle turns "sometimes", but not when subjected to resistance, then it's probably worn bearings.
- If the spindle doesn't turn at all, then your blender will need to be professionally repaired or replaced.
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