I need to replace the lid to my Kitchen Aid Chef's Chopper model KFC3100

I think it will start, when you close the lid

Probably the mechanisms in either the bowl or the parts of the lid that engage the bowl mechanisms.

Lost movement, new bowl or lid.

Top of lid twists...It was sooooo stuck, I was afraid to twist very hard. I got it though.

Go to http://www.appliancepartspros.com/ and search by model number. They have everything you need at good prices. They have saved me lots of $$$ on various replacement parts as they are usually the cheapest because of tax and shipping. Hope this helps!

I always mention 1800Parts.com because they get us everything. Check their website or call them and see if they can get you the part. Tell them we sent you and they might give you a discount.

The Kitchenaid food choppers have a few safety features implimented. If the unit is not assembled properly, this may prevent the unit from turning on. Proper assembly is below:

If it isn't all ready, please disassemble the entire unit. This means 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.

KFC3100 Manual posted at
http://www.kitchenaid.com/assets/pdfs/product/ZUSECARE/9705624.pdf

KFC3100 Manual is posted at http://www.kitchenaid.com/assets/pdfs/product/ZUSECARE/9705624.pdf

Manuals for Kitchenaid appliances may all be downloaded and printed from Kitchenaid.com.

On the main page, click "Customer Care" in the upper-right hand corner. Then click "Locate Manuals and Guides."

You will need to enter your model number exactly as it appears on the bottom of the appliance. You should find the model number on a white sticker.