Ok all looks fine except you have the step pins as 3, 5 and 7 and Dir pins as 2, 4, 6. Measuring voltage at the step pins will likely show a small enough voltage that your meter wont register unless you are on mV range (depends on active state) So recheck on pins 2, 4 and 6 with a Gnd pin.
If that doesnt help then for some reason your port is not being seen by Mach.
Hood