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Check to see if the lock screw is tight on the motor pulley, it sounds like the pulley might be slipping over the lock screw. You will need to remove the belt to access the hole where the lock screw is recessed into in the pulley. That is step one.
Step two, assuming the pulley is locked to the shaft, is to run it with the belt off. Does the motor pulley turn?
There have been a few problems with the drive motor transmission. The drive motor goes through a small transmission unit to the belt pulley shaft. So going back to the drive pulley, if it is not turning with the belt off, and you think the motor is turning, then it is likely that the transmission has stripped a gear. You can get replacements from Celestron, but you probably have a warranty issue.
I am pretty familiar with these drives. I will send you my mobile number by PM to discuss further if you wish.
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