Stepper motors are not working when connected with RAMPS 1.4
Photo Credit: Courtesy of 3DStockPhoto ( image)

to help you to solve this problem - please see my checklist

  1. are the stepper drivers connected correctly (pin1 to pin1)?
  2. stepper wiring is accurate (1a-1a..2b-2b)?
  3. is there enough voltage provided to the steppers (regulate)?
  4. if you are trying to move E0 or E1 then you need to disable cold extrusion as that stops rotation (waiting for 170C deg on the nozzle)
  5. is the firmware set to no move before homing (issue G28 first)?
  6. are pins set correctly for your board in Marlin?

the led's are set on my ramps as they are mostly giving a stutus for heater fan and bed, so grbl software could use those pins differently