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When the green lights do not come on when vacuuming with a Kirby, this indicates that your belt has either broken or fallen off. There is a magnet on the beater bar that activates the LED green light when it's spinning.
Here's a helpful video tutorial that we recorded, that will show you how to replace the belt, as well as perform basic maintenance on your roller brush to prolong the life of your belt as long as possible.
Video Repair on How To Check The Belt on a Kirby Generation G4:
I hope this was helpful! If you have any follow up questions, please feel free to use the comment field here on Fixya.
If you need to purchase a new roller brush, or belt for your Kirby G4, here are direct links to those parts on our website:
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That's because you got something caught in the brush and it tore the belt (likely) or slipped off the drive portion of the motor (unlikely).
If you look at the bottom where the brush is, there are a bunch of screws to remove the bottom cover usually and can access the belt and motor to run the brush. \
belts are usually 5 to 10.00 get a pack of 2 if possible and don't do heavy rugs or get material caught in the brush lest it will happen again.. typically you can find vacuums in the trash and remove their belts, usually is only 2 or 3 types of belts so get one for free perhaps from trash.
You need to replace the belt whenever the green brush indicator light goes out or is not steady. Be sure to observe the wear settings when re-installing the brush. The ends of the brush are marked with 1, 2, or 3 notches and numbers. In normal use the brush should have setting # 1 towards the rug. These settings adjust the brush for wear, and moving the bristles out prematurely will result in excess brush and belt wear.
Are the rugs long haired or short haired? Most likely the suction is just causing the noise when it picks up the rug and the buzz saw could be the beater bar hitting the rug then. I actually own a DC14 and it does the same thing and the rugs like to be dragged along. Nothing really to fix this, just the way it is. You could try it with the beater bar raised and see how well it works then but this sounds normal.
You need to start with a pair of scissors and patience. Sit on the floor with the vacuum roller visible and accessible. Snip a string and pull it off. If the roller stops, cut string at that point. Try again. this is time consuming, but necessary. We borrowed a vacuum from a family that had four girls with long blond hair. We had to de-hair the roller before it would work sufficiently on our carpet. Once the hair was off, it worked GREAT! It was so wonderful that we went out and bought a Dyson of our own; now we don't have to remove long blonde hair from the roller to get it to work.
If the dirt being vacuumed is not going into the dirt cup, then it must be just stuck in the hose and evenually will clog up. Check the hose and see it there is a clog in it, otherwise you have a years warranty on a new vacuum, take it into a warranty shop and have it checked out, take proof of purchase with you.
has either broken or fallen off. There is a magnet on the beater bar that activates the LED green light when it's spinning. 
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