Sounds to me like you have a serious motor fault The only thing i can suggest is to try and get hold of another motor I don't think for one minute this has anything to do with the board however i could be wrong, but if it was working except for the arcing before you removed the motor i would say it is the motor at fault. Check to make sure you have current down to the motor. Sorry i cannot help any further.
Carlito Corway
November 2006