The machine just stopped working. It was on and then it just stopped running. Now we try to turn it on and nothing happens. No sound no nothing.

You need to replace that motor.

check the motor some juice might have been inside of motor has 2 brushes need to work prpoerly on 110 vac rated at 10 amps or better. clean your machine look for signs inside not on the city streets..

This juicer has a 10 year warranty and you can contact Omega directly for warranty information and servicing the juicer. The link for their website is below:

http://www.omegajuicers.com/juicers/masticating-juicers.html

Push the reset button underneath - this worked with mine when the same happened to me; I only realised it was there after changing the fuse, which didn't fix it. I turned it over and found the button and voila!

do you have user's manual with wiring diagram? if not try H.B. If you get one, there is a diode that keeps your machine from frying from over-voltage. Kinda like a fuse, but is not a fuse. If you can check voltage across it, it is not the diode. That is a simple start and the most common problem for not starting.

A small piece of cabbage should not stop this machine. If it did stop, look for the red reset
button on the bottom of the juicer. I've been using mine for 21 years and occasionally it will
stop when run for an extended period especially if vibration is present. In each case I waited
a few minutes and pushed in the reset button.

Push red reset button on bottom of juicer. The
juicer is not designed for leafy produce, only
apples, carrots, celery, etc.

Regarding Jack Lalanne juicer. After making sure nothing clogs the blades., make sure the stainless bar is on the correct slots on top of the juicer, left and right. It has a safety switch that when its not closed properly, it won't run.

The pulp collection receptacle has a tiny clear plastic button on the bottom. If this has broken off (it happens often) the machine won't turn on. The button must be present to depress the safety switch at the bottom of the machine. If everything else is properly assembled and the machine won't turn on, this is probably the cause. Check the bottom of the pulp collection receptacle to see if the button has broken off. (picture #2) If so, replace it with a piece of pasta or a tiny piece of wood. Sounds silly, but it works. The safety switch at the bottom of the machine must be depressed before the machine will run.

I am sorry I might not be able to explain in English very well, but I hope it will help somebody.
In my case, the pulp container was a problem.
when you take out the container, do you see the little(very very small )hole that if you push with something like toothpic it makes sound like "click, click"? I guess when we put the pulp container back, the container is supposed to push the safety button ( bottom area), but I think the part of the container that push the button was broken, and it didn't start,so I just put something small inside the hole before I put the container back to the juicer, so it covers the missing part.
Their customer service doesn't help at all, I waited 1h to talk to somebody, and he couldn't help me. so please check that part.