My KitchenAid mixer will not turn it makes a loud noise.

buy a new mixer unless you are able to replace the motor because it is most likely burnt up because we have gone through 6 mixers and the motor slows down and eventually stops and just buzzes

thebsjunk - I don't know if you've canned the old mixer. If you've bought a new KA, congratulations to Kitchenaid. If you haven't, there's still a possiblilty that you might be able to fix it yourself. (For the price of KA mixers you'd think they's last a 'lifetime', but alas, KA quality is sorely lacking from their current products...but I editorialize.)
It's quite possilbe that you've had a gear tooth break in the transmission, which would lock up and prevent the planetary gear (agitator) from rotating in mixing bowl. This is what happend to my wife's 6 Quart Pro KA mixer. Since it was out of warranty, I decided to troubleshoot myself. First I downloaded the Parts List manual from the KA website so I knew what to expect. Then I easily disassemble the mixer to find that a bevel gear tooth had broken. After ordering the correct parts, and reassembling, it works better than when we first upacked it. The loud whining is absent...
If the motors gone bad, you can still replace that, too. Fixing your mixer yourself is much easier than shipping it off to a repair center, and you have the gratification of doing it yourself.
I hope this helps! Howard, Burke, VA