CNC shield V3 A4988 Motor Y does not move

Isn't the A-driver connected to double the Z-axis? Check that up!
I use that board but only x,y and z....

What about the x and z axles? Do they work?
How do You access the A "axle"?

Please post the code according to the advice in the code section here: How to get the best out of this forum - Using Arduino / IDE 1.x - Arduino Forum