We're having the same problem with our Jenn-Air JMC7000ADB microwave -- the turn table does not turn. The spindle turns when the glass tray is off but will not turn when it's on there. I'm pretty sure the motor needs to be replaced. Is this something that can be performed by a weekend DIYer or does it need to be done by a professional? Here is the part:
MAYTAG Motor, turntable, part number: 56001231
Thanks...