On a Softgloss, the machine is at home position when it is at the exit end of the bay with the machine almost touching the endstop bumpers. If the machine is older, you probably have the physical bayplates. After the machine is armed and a vehicle pulls in and onto the bayplates, that should cause the buzzer to sound. After 2 seconds, the machine should try to move reverse at that point (not forward). If not, it is probably generating a diagnostics code, and that would be really helpful. If when you try to manually move the machine is only goes a couple inches and stops, that sounds like you may have an endstop prox that is "ON" that it isn't expecting. I would recommend you look at the label inside the control panel for the front endstop (X7), a rear endstop (X8), or more likely it could be a wheel scrub retract prox (X43 for right, or X44 for left). If the machine is completely at the front, X7 "should" be "ON", but the others should not be. If those don't work, what codes are you seeing?