Is there a way to test if the stepper drivers on my board are working? I'm a week into messing with this thing and still can't get the motors to move. It's wired correctly, $4=1, and I copied the settings for the mini mill from the wiki page, but still nothing. I have $1=255 also, and the axes are free to move and the LEDs for the motors only light up when I move it by hand. I'm starting to think I got a bad board from the parts store.