Weird Problem with Ramps

Hey Guys,

I'm having this weird problem with my Ramps board.
The motors of all axes work fine when i connect them to the Y-axis pins but do not when i connect them to their respective pins.
For example when i connect the X-axis motor to the Y-axis pins,it works fine but when i connect it to its own pins it just doesn't work!!
Changed the stepper drivers but definitely no problems with that.
Varied the Potentiometer but no results there.
Is there any problem with the pins?
Is there any way i can check the voltage of the Ramps board without the stepper drivers ?

Please Advise!!