Blender blade won't spin?

SOURCE: Black plastic "ring" that fits over the spindle on the motor base snapped

I just bought a replacement part on ebay. It cost about $11, which included shipping. buy-it-now-store.com

SOURCE: grease build up around blade and where it attaches to base

Grease can only creep into the blender vase if the oil seal has worn out, or the blenders blade shaft is worn and wobbling. Try cleaning all parts in alcohol to soften the seals. Rebuild kits and replacement blades can be found here (http://www.brevilleusa.com/breville-parts/blending.html)

SOURCE: A blade on my immersion blender was bent slightly.

If you have a model with the detachable blades. Otherwise, you'd need to purchase the blending rod from www.wpcookware.com.

SOURCE: Blades on ninja blender won't spin, but motor seems to be working.

I don't have one, but inspect the shaft, it looks like there is a key on the shaft, then inspect the inside of the blade where it goes on top of the shaft, see if it looks like the shaft has spun out the blade and this is why it's not spinning.

Remove the blade and the container, then turn on and see if the shaft is spinning, it should be most are a direct drive.

So now if the shaft is spinning, that most likely means that the blade hole is broke where it sets on top of the shaft.

Look closely at the inside of the blade, you should see some type of damage like the groves are worn, I hate to see you buy one and it was the shaft that wore, but usually the blade will go first.