I've just had a quick look at your pcb design and it looks OK
but without the book or any other information I don't know what component values you have used
first with all the L6203 motor driver outputs at 0v ,
check the L6203's enable pin 11 is at +5v ??
If pin 11 is at 0v the L6203 IC's outputs are disabled !
once you have an output from the L6203's
if it does not step ,check you have the enable pin 10 on th L297 at +5v ?