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Megatronics v3 and Stepstick A4988 problem

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I recently bought a prusa i3 kit from reprapword.com.
After getting everything set up i started calibrating.
All the motors where turning and it looked like everything was fine.

After a while tho some of the motors stopped turning and at this point non of them are.
I can still power the extruder and the heating bed and all the leds are responding so i don't think the megatronic its self is broken.
I am however thinking i may have burnt out the A4988 stepper drivers, i forgot to put on the heatsinks.
Properly not a real smart move.

So is there a way to check if the stepper drivers are really burnt out or if the problem is with the megatronics v3?

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