Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: it does not turn on, why?
Document: Juicer would not turn on after 3 uses and there is no serial number so registering for the warranty is problematic.
At 11000 rpm this will cause severe vibration, which in turn will be held in place by the plastic cover and causes the smell, dust and smoke.I am sorry but the machine has to go back for some engineering changes!
Turn to "on" and nothing. I take it apart and reassemble it--sometimes as many as 5 times before it will turn on. Sometimes I'm in the middle of juicing when I turn it off (to grab another carrot or whatever) and then try to turn it on again...click and nothing happens. I have to disassemble it yet again, sometimes with fruits and veggies already in the chute.I am less than pleased with this product.
The replacement juicer died during the third use. I turned off the juicer to empty the juice cup, and it would not turn on again. I performed the familiar disassemble, clean, and reassemble procedure, but the juicer would not turn on. The juicer was dead with no sign of life.I called Omega again. They apologized for the inconvenience. They stated it may have overheated, and since there was not a reset switch they would replace the juicer again.
I know this is happening as I can see and smell the wear and melted plastic due to the friction caused by the rotating basket.Third, I almost always have juice escaping and trickling down the left side of the juicer and I know that I have assembled it correctly as this has happened several times and I check and re-check.Fourth and probably tied for most annoying along with the lopsided basket is the unit randomly chooses not to turn itself on.
New Omega BMJ390 juicer arrived today. During the first 10 minutes of operation, juicer stopped 3 times. It would not start again until after few minutes rest, then would run for a minute more and turn off. There was smell of burning plastic. Reading prior reviews, this was a design flaw that Omega had supposedly fixed. But my juicer was ordered 6/20/13 and has the same problem as older juicers. I contacted Omega by email today, but many reviewers said Omega doesn't respond.
You will spend so much more time cleaning this machine than you do the masticating juicers.While I was doing clean up of this machine, I noticed that the juice I had made was separating. This means there is a lot of oxidation in the juice it makes. I do not have separation in the juice from my other juicers.And finally - I am basing my review on this juicer alone. It is a great juicer for the type of juicer it is.
Works like a dream, easy to assemble, does a good job. Looks fine let out on counter when not in use.
What would have taken an hour to juice, takes this machine a matter of a few minutes. Awesome!The juice produced is practically pulp free and does not need to be strained at all.The Bad - This machine is so loud! True it is not as loud as the other centrifugal juicers I have tried but when you are used to masticating juicers this one blows your ears off!The Ugly - Clean up of the screen is a pain in the *#^!
We just started juicing, and this product meets our expectations. A little tip, in order to make the most out of this juicer, it is important to take breaks during the juicing process to clean the strainer, dump the accumulate pulp in order to minimize burning the motor out and maximize juice obtained out fruits & vegetables.
Answer: If the side clamps are not securely down it will not operate. This is a safety feature and it is very sensitive. Try adjusting the catch basket and the top making sure everything fits well then retry. It can be sensitive. To check you can try pressing in the side clamps while the on switch is on. If it activates then it is exactly what I am talkin about.