The LEDs over the individual axes are flashing because before they can be moved, they must be referenced. There should be a “REF” or “ZRN” mode button (reference and zero return, respectively) on your operator panel.

The MTB maybe have a specific procedure for sending your axes home. I would assume your operator would know.

Do you know if this machine has decel switches (dogs) or absolute pulse coders? On a 15 control I would assume it has decel switches which tells me you didn’t lose your home position as it’s technically defined via hardware

You’ll need to find out what the homing procedure is for this machine/MTB. For example, the generic procedure for a lathe with decel switches is to move the axes for several turns of the ball screw (couple inches) in the + direction and then press the - direction button for each axis and they should rapid towards the decel switches. Once they hit the decel switches, they use grid shift to determine when to stop.