Neither of those is related to it not booting correctly. I believe that is an old style connection for progressive machines.
If I had to guess your main board is not getting power from the power distribution board that is shown. I would re-seat all of those connectors, they get oxidation really bad. Deoxit if you have some.
If the computer still wont reboot you might need to do a processor reset, but only if you are comfortable working with components.
Gently pry and remove the processor chip from its socket. Short all the legs on a small piece of aluminum foil. Replace, and restart. I know it sounds a little primitive. I had one of these and had to reset it a few times until I found the bad connector that was causing the lockouts.
Also, Im not sure if your machine needs a battery. If you have time post a picture of the machine, and computer board.