I had the same problem once, and I was scared because I think I found a heat sink in my room that looked like one from a stepper driver. After moving the head manually back and forth for a couple of times it seemed to work again. Should still check whether the heat sink was from the stepper driver though, didn't have the time until now.
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Dim3nsioneer 558
One of my stepper motors sounded exactly like that when the stepper driver current was set too high. A few seconds later the stepper driver was gone... :sad:
The information you need for checking the stepper drivers / the currents can be found here: http://wiki.ultimaker.com/Electronics_build_guide
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