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frankvdh
When powered on, it should be very difficult to turn a stepper motor.
When I suggested checking voltage, I meant the outputs from the stepper driver. When powered on and not moving, you should see +12V across at least one pair of wires to the motor.
The voltage on the stepper drivers was 2V. I will check again later after I get home from work and will let you know.
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frankvdh
Sounds like the power supply isn't coping, which seems unlikely for a 550W supply. Maybe there's a dead short? Or a failed power transistor?
Sorry, this is about the limit of my electronic knowledge. Hopefully someone more knowledgeable will step in with more advice.
No worries, hope I can solve one problem at a time.