When I connect digiprog3 to the car it does not switch on but in the house with the A/C adapter it works. I think the cable is the problem.
Solution:
You can try with another vehicle to check if this problem exists or not. If you tried on different cars but still nothing, to borrow one OBD2 cable if it works it means the OBD2 cable is damaged and contact your seller to ship you another one; or another reason is the digipro3 OBD port has something wrong.