Push the" on" button and it does nothing - same

The pulse button may have become defective.

Replace switch, sorry didn't mean to say the obvious. Just good like that I guess

You need to replace either the bowl or the lid. Either the lid is not pushing the bowl mechanisms far enough or there is too much lost movement in the bowl part.

Hi,

Your PowerBlend Duet™ comes with a food processor button. This button is the perfect speed for all your food processing tasks. Always use this speed when using the food processor. You may also use the Pulse button with this function for pulse-chopping.
To use your food processor, make sure that the bowl is assembled properly and the blade or slicing/shredding disc and the cover are locked into place.
When you use the control panel, the LED will light next to each button you press.
Press the On button. For continuous operation, press the Food Processor button. Motor will start if you have followed assembly instructions.
To turn motor off, press the Food Processor button again or the Off button.
For on/off operation, called pulse-chopping or pulsing, press the On button, press the Pulse button, and then press and release the
Food Processor button the desired number of times. Motor runs as long as you hold the Food Processor button down. The motor stops when you release control switch. Try it a few times.
You control the duration and frequency of pulses by the length of time you hold the Food Processor button down and the rate at which you press it. Pulses should be short bursts. Allow enough time between pulses to let food in work bowl fall to bottom.
Always use the Food Processor button for pulse/chopping. Never turn cover back and forth to start and stop processor.

You can download manual from the below link

http://www.cuisinart.com/share/pdf/manuals/bfp-10ch.pdf

ENJOY! RATE THIS SOLUTION
RNJ VINOD KUMAR

The Kitchenaid food processors have a few safety features implimented. If the unit is not assembled properly, this may prevent the unit from turning on. I am thinking this is an issue of assembly because the light is on, so the unit is definitely getting power.

Proper assembly is below:

If it isn't all ready, please disassemble the entire unit. This means removing the blade and/or disc, blade, removing work bowl, work bowl lid, and blade.

Start by placing the work bowl onto the motor base. The work bowl handle should be facing at 9 o'clock, which is out to your left. Rotate the handle downward until it locks in at the 6 o'clock position, which will lock over the center of the button panel.

Repeat the process with the work bowl lid. The blade does not need to be present for the motor to engage, if this is an assembly issue.

Sounds like a safety feature working. Unplug. Take apart as if you are going to clean it. Check all parts carefully to see if there is anything broken, like a nub.(Are all parts there?) Put back together, making sure they are fully engaged. Plug in and try. This happened to my food processor and it was a bit of dried food stuck in the bowls sliding track that kept it from clicking fully connected. Hope this helps!

I started from scratch with the assembly instructions. Got it together correctly and now everything works.