Stepper only Turning One Step

Hi all i'm building a 3d printer using a RAMPS 1.4 with NEMA 17 Steppers and using A4988 Drivers. I had a nightmare with trying to wire the steppers properly, however now i can only seem to get ONE STEP out the steppers then they do not move in either direction after. Would this indicate a problem with my endstops? When checked via Simplify 3D they all check back as open and not triggered.


Any help would be appreciated.

Thanks

Alex

Ok so i hooked the temp sensor up and im getting more movement out of it, however now it's got the same problem as before, how are the cores paired on the drivers? Are they paired using the letter or numbers? For example, Should 1A & 2A be a pair, or should 1A & 1B be a pair?

Thanks


Alex

All sorted now, the voltage needed adjusting.