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If NO LIGHTS come on and not a single thing operates, I too would say that it's most probably the THERMAL SWITCH, activated when the motor gets too hot and is in danger of damage. A very cheap electronic device, quick and easy to remove and replace.
Empty the grinder and see if it will run with no coffee bean in it. Some times debris will get caught in the grinder because it got mixed with the beans from the factory. If it runs your good to go. If not then the mother connection are not solid and it will run off and on at will.
you must screw off the burr holder plate screw (in center) you will order one special screw, drill shaped, when the burrs roll it will mix and take down the coffee beans. That is solution i applied to many grinders.
PS: beware the direction of burrs must be coordinated with new screw.
On the bottom of the Grinder, You will find several Rectangular holes. With a flat screwdriver push tangs to release bottom. In main shaft, there is a small slot for a flat screw driver. Inseret proper dcrewdriver in slot and turn blades counter clockwise. This should remove blades..
As I can see, what happens is that some coffee grains stucks in the way from the upper pot to the grinding wheel. This is not something usual, but possible if coffee grains are too big and are placed across the entry of the mill. Try cleaning more deep with some old toothbrush. Look for a clean and even surface of the duct.
Other cause might be a loosen mill hub/grinding wheel off the motor shaft, which would require dissassemble of the appliance to be repaired.
The Krups Burr Grinder GVX2 featured in the picture is not a coffee maker, per se, it only grind coffee beans to use in other coffee makers. It is a lousy machine, and I would recommend returning it or not buying it. DO NOT PUT WATER INTO THIS MACHINE. It will cause electric shock.
Mine had a piece of the top/bean lid broken off and lodged in the groove preventing the lid from going down far enough to release the safety switch which is on the right (as you look at the front) in the bottom of the groove. Note that there is another safety switch in the body of the grinder above where the ground coffee comes out that must be working as well.