You could call Hurco Tech Support 317-298-2635 for assistance.
Since the machine was sitting for so long, it more than likely drained the backup bateries on the memory PCB if it is a Ultimax 2 Control.
When you power up the machine watch the screen, see if there is some type of error "Default config loaded"
When it is booted up and on the Config Screen, Press ENTER, 639, ENTER. The cursor will be on the X Travel Limit line. Press the Zero key and then Enter. Then Press the F8 Exit key, (cursor is now on the bottom left corner of the screen). Now Press ENTER, 999, ENTER, the machine will now Re-Boot. This will force the machine to read the switch settings on the Personality PCB and hopefully re config for the correct travel limits on the next boot.
When it boots up, Press F8 Exit, then manual Power ON, and Start. See if you can manually select an Axis and Jog all of them BEFORE attempting to calibrate it. Watch the Machine Position Displays, if they are all ****** then the LS Map will need to be reloaded from the back up, or defaults.
If all axis Jog OK without a fault, then Calibrate it. At this point call Hurco Tech Support at the Phone # above.