Without knowing more about the cabinet model and any associated GMS/TITO accessories, I would answer generally. . .
Machine Disabled is related to the connection with the gaming management system. (The part of casino-connected systems that deal with ticket in ticket out, send meters and security info to the back-office equipment. If you have a TITO system (GMS) connected but not powered on, the game might be waiting for that. The game might be disabled by that same system using a GMS disable (menu option). If you got this machine from a casino, the cabinets must allow for remote disable via GMS to comply with regulatory agencies. You may have to (using elevated privileges) disable the requirement for a GMS system to be present and online.