What I did to my O2 today (actually it was Friday), I found the electrical fault that was preventing the car from starting. With full power on gauges, lights, fan, everything, the starter would not turn, no nothing.
Ultimately after some prompting from local 'O2 heads here in H-town, I inspected all wires and discovered that the ground strap coming from the neg battery terminal to the fender was frayed. Put a jumper on there and Vroom! she started right up.
Lesson-learned - check the ground strap