Prusa i3, extruder not responding

Hi, after re-assembling my prusa I've got a problem - x,y,z axis work great, but extruder motor never responds. I try to extrude with "pronterface" and "repetier-host" with normal temp (180c). Prusa dont show any errors, but motor not moving.
I have tried to connect extruder motor to x axis port - its working!
I assumed that extruder0 port broke by short-circuiting. I have tried to change e0 pins in pins.h to e1 port.

#define E0_STEP_PIN        26
#define E0_DIR_PIN         28
#define E0_ENABLE_PIN      24

to

#define E0_STEP_PIN        36
#define E0_DIR_PIN         34
#define E0_ENABLE_PIN      30

But it is also not yield any results. A very small probability that broke immediately 2 ports.
What else can block extruder in software except minimal extrusion temperature?
what are the ways of diagnosing this problem?

Have you tried your extruder stepper driver in the X socket on your board.

If this works it will at least rule out the stepper driver

BTW. What temperature does Pronterface say that your extruder is at ? Are you sure its up to temperature (ummm but from memory I think you get a warning message if its too cold and you try to extrude)