I have a vitamix commercial 2 speed blender VM0100A year 2008. It recently stopped working. If I press the button to start the blender it sounds like it clicks to start but none of the parts turn. Also when I turn the main on/off switch on the light does come on. I replaced the drive socket, but that's not the problem. I have replaced a drive socket on my other blender before and it works fine. What could be the next thing I could try and replace or what is the next most common thing that goes wrong? These blender are used to make smoothies and shakes. Both my machines are 9 years old, but are not used as much as ones just in a smoothie shop. I'm hoping it still has some life without having to get a new one. Thanks!