Check the belts and the high/low pulleys. Does the machine change gears? Will the spindle start in a different gear (high or low)? Can you turn the spindle by hand? If not first check that the belts did not fail and get balled up in the drives. If all of the above checks normal, then the drive, probably a Vector drive, is in for. If you replace this yourself be absoutly sure you tune the drive immediatly after install. It is very easy to do, however if not done you will toast that $5600.00 V drive.