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If the spindle driver is good the spindle should start spinning in the 2600-3000 range (High Belt) and the spindle driver LCD screen will read numbers in the same 2600-3000 range. If the numbers are zero and the spindle is not spinning then the driver is bad. If the spindle driver is showing numbers in the 2600-3000 range but the spindle is not spinning in the 2600-3000 range (High Belt) or not spinning at all, check the spindle motor to see if it failed. 440 Check Spindle Motor https://tormach.atlassian.net/wiki/spaces/PCNC440/pages/4012114285/PCNC+440+Spindle+Won+t+Turn#Measure-the-motor-resistance-(%CE%A9)