Sounds like its working, but nothing happens

I had the same problem with mine, it's due to the fact that the smaller spring has become un-lodged from the ******** itself.

You will need:
1. Roll of electrical tape.
2. Utility Knife
3. A small slot head screw driver OR a pair of needle nose pliers.

The solution is to unscrew the silver ring so that is can be moved up and down. Now, you need to use a utility knife and cut the blue rubber off of the spring. Once you have the blue rubber but off you can see a large spring with another smaller spring inside. Push the head of the ******** till the larger spring's coils are an 1/8 to 1/4 of an inch apart. Next take either the small slot head screw driver or a pair of needle nose and jam the smaller spring back into the hole in the center of the white plastic piece inside of the larger ring. Next plug it in to make sure the vibration is working, reattach the silver piece and tape the larger spring with electric tape.