Lots of questions to help diagnose your issue..
Do you have 12v wired into the 12v 5amp ramps power socket? this is used to power the steppers. is this power supply on?
Is the Stepper driver plugged in the correct way? Please provide clear photo of the board as it is currently wired. See if we can see anything
Is the stepper wired correctly, if you have followed any color based diagrams its probably wrong. Identify the coils and make sure coil one is on pins 1 and 2 and coil two is on pins 3 and 4 of the stepper plug. More info here
Have you set the correct board type in your firmware (normally 33 for a ramps)
Have you adjusted vref (slightly different depending on your driver) eg [reprap.org] eg [reprap.org]
Are there 3 microstepping jumpers plugged in under your stepper drivers?
Do you have endstops configured or disabled? (If they are enabled, you cant move in the direction that is triggered) check with a m119 command to the board
And finally what type of stepper is it? as some just need to much current or voltage and aren’t suitable to be driven from a pololu type stepper driver.
Do you have 12v wired into the 12v 5amp ramps power socket? this is used to power the steppers. is this power supply on?
Is the Stepper driver plugged in the correct way? Please provide clear photo of the board as it is currently wired. See if we can see anything
Is the stepper wired correctly, if you have followed any color based diagrams its probably wrong. Identify the coils and make sure coil one is on pins 1 and 2 and coil two is on pins 3 and 4 of the stepper plug. More info here
Have you set the correct board type in your firmware (normally 33 for a ramps)
Have you adjusted vref (slightly different depending on your driver) eg [reprap.org] eg [reprap.org]
Are there 3 microstepping jumpers plugged in under your stepper drivers?
Do you have endstops configured or disabled? (If they are enabled, you cant move in the direction that is triggered) check with a m119 command to the board
And finally what type of stepper is it? as some just need to much current or voltage and aren’t suitable to be driven from a pololu type stepper driver.